"The way to protect the female lead's older brother" is probably my favorite villainess manga. Beautiful art, has managed to remain interesting, and I actually love how the female lead has developed. Without giving you any spoilers, this mc transmigrates into a novel in a pretty shitty situation and you can actually feel the danger.
Also try "I want to be you, just for a day". Medea is a badass and she hasn't stopped being intimidating after 77 chapters.
"I tamed a tyrant and ran away" has a female protagonist that while not exactly a villain, has a very specific goal that can make her be quite ruthless.
And finally "Untouchable lady". Not a villainess story but a "revenge" one. Very satisfying seeing the female mc giving hell to the people that wronged her.
And those are the only ones I can think of. Hopefully you will enjoy some of it.