Also I would not mind a Female MC if there isn't a Male MC
I think u should try "The returned C-rank tanker won't die!" - it's a female protagonist, no romance.
"Player who returned 10,000 years later"
"Myst, Might, Mayhem"
https://www.mangago.me/read-manga/resurrection_of_the_catastrophic_hero/
This is really funny but kind of what you're looking for.
I highly recommend the Resurrection of the Catastrophic Hero. It's really good, tho there's a hint of romance but you'll love her personality. It doesn't focus on romance.
Do any of you know any manhwa that has like a ruthless MC? Kills without hesitation, doesn't let other talk shit in front of him, he's nice not necessarily evil but just don't take crap from others (don't recommend me Return of the Crazy Demon, I already read that lol) I meant like in modern world with gates, hunters, ranks and all that, preferably NO HAREM