For me, what makes me abandon a series the most is the wait, that is, when a new series emerges and it is interesting but then they make you wait a long time to give you new material. For me it is super frustrating and I end up leaving them forgotten. That's why usually when a new anime comes...
Right now I'm looking at one that's kind of old (I think it's from 2010) it's called: DATING WHATS LIKE TO BE IN LOVE, highly recommended! it's hilarious.
I really don't think so, a few years ago it seemed very promising but nowadays all the isekai have become super repetitive. They only change a couple of things but they are practically all the same.