The MC is lovable and relatable. Of the novels I have read, she's probably the closest one actually person. She's not going out of her way to do that right thing or to save the world, nor it does she only care for herself and goes about her own business. She's not a mindless person as in some stories, nor is she so overpowered that she can solve any and all problems.

There overarching story of the world doesn't really only move around her, but it is told as we follow the MC and her role in reaction to everything that is happening in the world.

As for the Transmigration, her past and other life isn't a major point of the story unlike in "My Disciple Died Yet Again". It only serves the role that she isn't from this world and is the cause of everything that happens to her in the story.

The novel is at time funny and at times emotional. The story is well written with good use of foreshadowing and pacing (except the ending).
The romance in the story develops and her relation with various male characters improve. It doesn't follow most story with love at first sight or destined to be together. You get to experience how her relationships change and improve overtimes, and how it turns to love and romance. As a result, it's hard to tell who the male lead ends up being and the second half of the novel.
The story is not very focused on power level progression. The story never relies on her become strong enough to defeat the bad guy. In fact she often isn't the one to solve the problem, she just plays her role in the story. She does becomes more powerful as she changes the body she possesses. Each time she changes her body, it is well tied into the story and not just for the sake of her getting stronger. She never reaches the end of the power spectrum and relies on her strength on the final fight. She simply doesn't her best just as everyone else, and watches as the pieces and cogs that was set up throughout the story comes together.
The story line isn't episodic like "My Disciple Died Yet Again", but is the more concrete of the two.
Both "My Disciple Died Yet Again" and "Cultivating to Become a Great Celestial" suffers most at the ending parts of the novel. As "My Disciple Died Yet Again" ending makes your wonder why anything happened in the first place, when the story could have just started at the end and have everything worked out as good or even better, "Cultivating to Become a Great Celestial" makes it seems like the author can't wait to get the the ending she's written, so she gives random characters unreasonable, abstract and out of place powerups to prepare everyone for the final fight.
"My Disciple Died Yet Again" could have used a better reason for her perform her various missions in the story; perhaps better ties her into the history of the 3 realms as the author probably initially intended.
"Cultivating to Become a Great Celestial" could probably use 60-100 chapters to expand on the immortal realm and better pace the story before the ending.

Although he's not the most handsome or popular or the one that knows her the longest, he almost sacrifice his life and maybe he doesn't even know that he already liked her at that time? He's the only male lead that truly prioritise her. The others have some kind of burden or complexes.

The first ML, the ex-husband, he's been traumatised since he was almost/ maybe r*ped twice. He has a mysterious background (bloodline), a true prodigy, and has that ML halo. He's the kind of ML that usually get healed by the FL and be together but I guess he's too traumatised to be with any female. He's an enigma, he just suddenly pops up and gone in a sec.

The second ML, the tsundere, he's the first one that helped and almost sacrifice his life for our MC. And our MC is still in her 70 years old form. He always mocks our MC but he always helped her (he said that she is his lackey and no one can bully her except for him) and kinda taught her alchemy (he just throws the book and flew away). I thought he was the ONE, but he takes too long to realise (?) or idk. It's bit complicated since Li XinMei has a 'thing' with him at the start before she 'died' and he had a crush with our MC (but he didn't realise) and our MC is just being a granny for both. But it's so funny that he keeps denying and get confused about his feelings, like 'do I really like that granny? that 70 yo with vicious eyes and creaking bones? no way, my taste is not that heavy, probably'. Also, he got an inferiority complex around or MC since he used to be the stronger one but since our MC has MC halo ofc her cultivation will soar like no other. He keeps chasing alas he has missed the right timing.

The third ML, the true ML, he was searching for his family's spirit guardian, yes it's Dabai and Xiaobai. He is from the upper world and respectable family. Also, he's very good building arrays, cooking, combing hair, packing, just a house wife material (?). He's very cute when he tries to bond with Dabai, he tries so hard to get close to Dabai but when our MC send a small gift, Dabai will immediately run to our MC. He looks cold and distant but actually very caring. I suddenly remember when his family were trying to get Dabai and they take all the handsome guys for our MC to select for marriage since Dabai is not willing to separate with our MC. That was so funny when the handsome uncles were trying to flirt but our MC were calling them ancestors. He confessed in the most perfect timing when our MC love index is at its highest. He's very lucky or maybe it was fate since our MC fell in to that abyss and met Dabai?

The fourth ML, little teacher/uncle, he's a swordsman and is our MC's teacher. He's mysterious and only cares for training but sometimes he would help our MC. Our MC had some 'thing' for him but idk since I mostly MTL-ed so sometimes it's not very clear. Anyway his cultivation somehow backlashed and became a demon lord, I still don't understand how it came to be. He's the final boss and I think he likes our MC as well (?) or was it just an obsession of becoming stronger than our MC? Why does he want to destroy the 3, 000 worlds? why does he so obsessed of being stronger? Am I lost in the translation? so many question unanswered. Btw, he died in a anti climatic way, the ending was a bit rushed, I think the last arcs after the 'time continent' arc were all a bit rushed.

The first group that she met before cultivating, all the members will betray her in the end. Yes, even Li XinMei! That's why I was so shocked.

I've heard she switches bodies a few times, so the old lady body is just the first arc.