i've recently fallen down this rabbit hole of ... female lead is reincarnated, or travels to a book she's read, becomes a villainess, etc... it's new to me, and I'm finding there's a LOT of this genre. I've love some suggestions of what you think are the best ones. ^_^
these are what i'm reading so far:

Beware of the Villainess!
Cheating Men Must Die
The Villainess Lives Twice
The Villainess Reverses the Hourglass (i read the novel of this, was fantastic)
Rebirth Common Circumstances

thank you! 😀 <3

WEBTOONS ヽ( ★ω★)ノ

-Living as the Tyrant’s older sister

• Crimson Karma
• Chitra
• I became the Villain’s Mother
• Miss Not so Sidekick
• Lady Rose wants to be a Commoner
• Lady Baby
• The Reason why Raeliana Ended up at the Duke’s Mansion
• Death is the Only Ending for the Villainess
• Sincerely: I Became a Duke’s Maid
• The Emperor’s Companion
• This Girl is a Little Wild
• The Duchess with an Empty Soul
• Throw me away, please
• I Choose the Emperor Ending
  I made sure to try and pick some with 10 and up chapters translated! I love these so I hope you enjoy! Also I’m a new user so I don’t know how to add links...sorry😕

How about male protagonist who got transported into another world.

Trash of the Count's family (really good. Wuxia world) about a guy who wanted to slack of but need to make his move to have a peace in his new world. P.s he transported as a villain.

My death flag no signs of ending (already have a manga, check it out;
(www.mangadex.com/chapter/933816/1) got transported in a game world as a minor villain where all his speeches are program so they are all rude.

Transmigrates into Noble's beaten son (https://www.scribblehub.com/series/131121/transmigrated-into-nobles-beaten-son/) this one is new, he transported again as a minor villain but one that is already beaten or not in the game. I think this one has slice of life and school life theme with swords and magic.

Akuyaku Reijo nano de Last Boss wo Kattemimashita
The Savior's Book Café in Another World
Honzuki no Gekokujou Parts 1, 2, 3 (translation team is working on part 2 currently)
I Am Troubled That My Fiance Is a Villain
Madougushi Dahlia wa Utsumukanai (Novel) There are 2 manga adaptations, pick one or both
Mahoutsukai no Konyakusha
Tensei Majo wa Horobi wo Tsugeru
Kumo Desu Ga, Nani Ka?
Villainess Level 99 I May Be the Hidden Boss but I'm Not the Demon Lord

Some of my favs are

"I'm a villainous daughter so I'm going to keep the last boss"

And

"Suddenly became a princess one day" (aka "who made me a princess" )

thanks for all the suggestions! should give me some reading material for a while ^^

WEBTOONS ヽ( ★ω★)ノ

No problem. Hope you like it.