I mean since we have so many isekais already shouldn't it be considered a genre itself
Isekai isn't a genre. There is a tag system that's been in development for a couple years now that anybody can work on which features it as a tag - https://anilist.co/search/manga?includedTags=Isekai
Wikipedia classifies it as a subgenre:
Isekai (Japanese: 異世界) (lit. "different world") is a subgenre of Japanese fantasy light novels, manga, anime, and video games (...)
If we were to include every subgenre and all the subgenres of them and so on, we basically get to tagging system.. ¯\(ツ)/¯
So we might as well use tags, which are available already.
There is, but it's a tag and not a genre.
https://anilist.co/search/anime?genres=Isekai
Unfortunately, there's just no way to filter your lists by tag. What you can instead do is go to Browse, filter by Isekai, and then go into the filter settings and enable "Show only my anime."
Hopefully they add the ability to filter by tag and not just by genre on our own lists soon.
The thread "Pls add "Isekai" to the Genre Filter of the Anime List" and its comments have been merged into this thread.
You can view the merged thread's body below:
Well, the title is almost all i wanted to say. I think it would be nice to have an "Isekai" genre filter for the anime list. When someone asked a few days ago about "what isekai shall i watch next?" i had liked to look up my "isekai" list but unfortunately it's mixed in between deathnote, fairy tail, kingdom, naruto etc. etc.
Ofc I was able to name one that might not be that common to help that person out but for real I just wanted to say "hey: look up my isekai watch list here, maybe there is an anime you havent watched by now."
Well, it's not as efficient, but you can go to browse and it filter to show only anime on your list with the isekai tag.
If you want others to be able check the isekai you've watched easily, then from that browse page you could either A) add a note to each isekai anime containing something like "#isekai" so that one can search for them in your list (the search box above the lists searches through notes and titles), or B) add all isekai you've seen to a custom list.