Isekai is fascinating to me because they're almost always terrible even though they have such an open premise, and they go through the craziest fads.
The industrious-person-gets-the-chance-to-own-the-products-of-their-own-labor-and-actually-have-friends subgenre us pretty big right now, though I think it was pioneered by Ascendence or a Bookworm, which is actually pretty good.
Sadly no anti slavery Isekai yet, but the on from last summer where the protagonist kills isekai'd people was fun.