I suggest:

 "Chronicles of The Hardships of Komachi in The Sengoku Era". It's a rare kingdom building with a female protagonist with no focus on romance. It's slice of life but it's interesting how she changes Japan as Oda Nobunga's adviser

"Losing Money to be be a tycoon" - not since it it's your cup of tea since this is  comedic with his system of being able to earn more if he spends more on his business. He accidentally creates a business empire. This one is already completed 

"Eternal Club" is kinda like if the Illuminati president is the protagonist but he does actually have powers so he builds a secret organization with legal fronts. You might have to mtl this or read the manhwa

Other webnovels (not in N.U.):

▪︎ Wall Street of the Third Generation Chaebol (재벌3세의 월스트리)

Late 19th century. The United States was ruled by oil tycoon Rockefeller, steel tycoon Carnegie, and finance tycoon J.P. Morgan.

I fell on Wall Street, New York.

"...Detroit D. Morgan?"

I didn't just fall, I was the son of J.P. Morgan.

▪︎ (still finding other novels)