I know one that's similar if you're not already reading it, it's called "isn't being a wicked woman much better", mc doesn't start off with her business immediately but it's presented Early on and develops fairly well. Something else thats similar is "please don't come to the villainess's stationary store". Those are the only two that come to mind right now but I can definitely take a deeper look in my collection if you'd like!
Okay! I've done a little digging since I posted that comment and I've found some thing though most of them don't have the business as the main focus (pretty much all these manhwas are romance focused). "The world's best engineer" this one focuses on building up the main characters estate and has to do with architecture. "I'll just live on as a villainess" this one is also focused on running the estate mc lives in but she does have a gem business. "The tyrants only perfumer" It's been a while since I read this one but from what I remember I enjoyed it, she has a perfuming business and is in competition with another business. "I'll be the matriarch in this life" This is another one I haven't kept up with but mc does a lot of work in her family to set business stuff up. "A divorced evil lady bakes cakes" I remember reading this but I don't remember any details, I do remember her goal is to run a bakery. "The duchesses 50 tea recipes" this was really wholesome and she doesn't immediately open her business but from the start it's clear that she's passionate about tea and I enjoyed how the mc spoke about it. "The villainess turns the hourglass" I don't remember much about this manhwa but I do recall her being interested in business and mc joins some sort of gentleman society. Anyways, those are some that I've personally read but you can always go on reddit or forums to find more stuff. If you have any other things you're looking for I'd be happy to help, I have a lot of reading experience so I know a little bit about a lot. It sounds like you would be interested in more "accomplishment oriented" stories, which I personally really enjoy in manhwa and can probably give some recommendations for.
I've now read everythingexcept the hourglass, and I have a few chapters left of bakery. Most were ones I'd already finished/ caught up on, and I read the ones you'd recommended. That said, in the meanwhile, I found a near perfect example of what I was looking for: I Don't Know The Original, I'm Too Busy Trying To Make A Living.
If you're interested in looking for more, I'll absolutely, happily take more recommendations! Thabo you SO MUCH for everything thus far!
Omg hi! I'm so happy to hear from you again and I'll definitely check out your recommendation! I do have some more suggestions, but the last 2 don't involve a business but they're still manhwas I think you might like. "The s-classes I raised" this isnt transmigration story but it does involve time travel and the hunter/dungeon setting in a modern world. It's one of my current favorites and mc starts a business with beast taming. "Preference for the possessor" This one has a hunter/dungeon setting set in a different time. There are nobility in this world but it definitely not a focus, it's more focused on mc gaining strength. She also does start a potion business relatively early on. "Death is the only ending for the villainess" This is a manhwa I would recommend to anyone if they're not already reading it. This is another favorite of mine and I would rank it above most, if not all, other transmigration manhwas I've read. I would love to write a much longer explanation on my love for it but it really centers on mc trying her best to survive in a shitty situation and at times has moved me so much I've wanted to cry. "I'm a martial art villainess but I'm the strongest" I enjoyed this one a lot in the beggining and mc works hard to establish herself in the world and in her family. After around chapter 80 i started getting a little bored but that might've just been a me problem lol. I definitely have more recommendations but my memories tend to fog and my responses are long winded so I don't want to overwhelm you!
I was hoping the part about being good with business was a green light toward an isekai where the Mc uses her knowledge of our world to better her new one that is scientifically and technologically stuck in historical times.