We're somehow to believe that this family hasn't torn itself apart already? Training for a kid with better than average potential: none. Aside from teaching the MC base forms, the parents leave him to his own devices. Then, at the family competition, there is this stupid rule of "nobody is able to interfere"... even when there is an obvious victor, who is in the process of causing their opponent permanent harm? This rule is there to make it seem unfair that the MC wasn't able to completely cripple their opponent with everyone watching, but all I could think about when this was being discussed was "this entire family is obviously too stupid to live."
The only believable antagonist for the beginning arc is the MC's cousin, because he is only an age seven or eight bully. Him, I can believe. His father and the grandfather are the typical one-dimensional "give unfair advantages to an opponent" petty antagonists. Sure, some favoritism is believable, but the author takes it to ludicrous extremes. Allow the bully kid to boast that he'll cripple other children? A-Ok, and let's give him a chance to act on it. After a year has passed and the first failure has festered into enough antagonism that in their perception, the bully kid is likely to try it? Sure thing, we don't mind that either... actually we lost face last year, so that would be great!
Are all of these guys children? There is no effort by the author to pull these characters out of this cookie-cutter "xianxia family villain" portrayal.
MC decides to hide their potential from everyone? Why? Not really explained. Oh, sure, there is a throwaway line buried a few chapters in where it is said that showing his talent would be a calamity in some way... but that's it. It's not like the MC found an item that would be able to be taken from them. How would it be a such a detriment? This logic isn't followed up on, it's just assumed that the reader will agree that since it is a xianxia novel, the MC has to conceal his ability.
And it's not like the MC ever even thought about telling anyone. How much effort would it be to have had the MC actually take a chapter to actually think about the pros and cons of a few different options? If they had decided to keep quiet after considering the options of being open to the overall family, or of being open to just his father and mother, maybe it would have been acceptable. But either the author didn't think about it, or couldn't make any real plausible reason for him to keep quiet, so it gets glossed over.
Add in the MC's inability to ever take a step back and the inability and think about the consequences of his actions, and you have the perfect trifecta of stupid MC xianxia tropes.
Now all MCs will have a certain amount of this, but a good author will either space out lucky finds so that it doesn't break immersion, or have the MC actively seek dangerous situations to find the prize at the end, or (for abilities) bring it up much earlier than the ability gets used so that it doesn't seem out of place. Now let's review this novel. Again, this is all within the first 30 chapters:
MC is a reincarnator.
MC gets a super rare martial spirit that gets misidentified.
MC was a super awesome martial artist in their prior life, and their training of their old style has great benefits for their new style.
MC meets a smart spirit monkey companion.
MC is brought to some awesome rare fruits by said monkey.
After eating fruits, MC cleans off in a lake. The lake has a hidden cultivator's cave!
In the cave is a super rare martial technique and magic swords and a super rare dimensional storage ring!
Later, the MC runs into another person with the same technique and helps him since he is really injured. He happens to be super strong.
We find out that the MC also has some technique to heal broken meridians (from his prior life I think?).
MC's lucky find in the cave means he is actually the true successor of another kingdom/family of some far away land!