Recommendations please

not completely sure what genre ur asking for so here are a bunch:

psychological horror/thriller:

girl thinks she isekai'd as a romance novel protag but on the day of the ml's confession zombies start showing up and everytime she dies the day starts overshe does not stay completely sane after dying that many times but the main focus isn't on her insanity it's mostly solving wtf is going on: https://www.mangago.me/read-manga/survive_romance/

this one is about a kid who's mom was a serial killer who basically traumatized him and then died. bro is messed tf up ab it. really good and it kind of has an abrupt ending but it's still worth reading: https://www.mangago.me/read-manga/from_the_red_fog/

psychological romance/thriller/horror:

this one is like psychological romance horror. this girl has regressed a bunch of times and it's made her lose her mind so she j starts murdering everyone who wronged her. I haven't read it in a while so I don't remember much but she's definitely crazy: https://www.mangago.me/read-manga/resetting_lady/

action:

he just has a power that's super op called bloodlust but everytime he uses it he loses his mind: https://www.mangago.me/read-manga/my_school_life_pretending_to_be_a_worthless_person/

this b!tch is insane and always has been but also op:

school where the hierarchy is decided based off gambling (mc never loses a game): https://www.mangago.me/read-manga/kakegurui/

idek how to explain this one but it's good asf. one of the best psychological game mangas: https://www.mangago.me/read-manga/tomodachi_game/

those are the ones i could think of off the top of my head but idk if they work for what u were asking, hope they do!

https://www.mangago.me/read-manga/in_her_fifth_life_the_villainess_lives_with_the_evil_dragon_the_evil_dragon_of_ruin_wants_to_spoil_his_bride/

Thanks for the recommendation sadly it wasn't quite what I searched for and I mostly know them already but the rest that I don't know will be checked out

'Free in Dream' is basically what I'd recommend u. But it's kinda f*cked up :P

yeah I was gonna say this one but I feel like the mc becomes sane a little too quicklyml just keeps getting crazier though

Absolutely, like every character seems kinda off here - specially ML and FL.. there are way too little sane people in this webtoon ahahaha