I also hate harems so if you're looking into non-harem actions there are lists for that. There's also the all genre page where you can find all sorts of genres and you can tap the icon box on the left of the genres listed, tap 2 times because the first one will be a check mark and the second one will be an x mark.
https://www.mangago.me/home/album/655984/
I forgot to add but the lists appear on the bottom of the manga's

Bro, I swear that every time I see a reincarnation or isekai bl manhwa with good art, it’s always a harem. Like, why is it always a harem??? I don’t like harems cause it still feels like cheating to me half the time and my pick never actually wins lol. But seriously, I can only think of like one bl about reincarnation with good art. Everything else has either mediocre art, or it’s always a harem. Am I the only one noticing this?? Sorry, I just needed to ask, cause am I looking in the wrong places?? Does mangago think I like harems????
No hate to people who like harem manhwas of course. It’s just my own personal taste, since I just dislike the harem genre in general(it just feels too icky for my personally) though, there are def some good ones out there.