Don't sleep on Nikke
Seriously I know a lot of people will write it off as a degen gooner game but in my opinion it has consistently the best story out of all the gacha I've read and it's by a long shot.
That being said I've only read FGO, Genshin, ZZZ, Star Rail and Wuwa. So there's plenty I haven't tried.
I do think lostbelt 6 in FGO is the best story chapter from a gacha but as a whole Nikke is the best for me by far. Especially if you enjoy more serious and darker story lines. They also always cook in their anniversary event stories.
2nd Anniversary is still happening so I would highly recommend people to at least give it a try if you like to read the stories, if you're all about gameplay then it's nothing special.
Edit: Yes I realise it does well in the pvp rankings and it's popular but some people think it's just cause of the fan service and others won't try it cause they think fan service is the only thing the game has, just wanted to say it's much more than that.