what to watch next?

Overlord is, in my opinion, the best of the isekai genre. It's dark fantasy and follows a player of a game who is transported to a real world version of the game world and follows him losing his humanity and taking his place in the world. Darker Than Black is a good one too. I'm just about to start Season 2. Someone mentioned Kill La Kill above; it's a really good, goofy anime. Can't go wrong with it. One Punch Man season 1 is so good. Great story, awesome visuals and animation. Season 2 is out now but they couldn't get the same animators so it's lacking in that, unfortunately, but they have the same writers and voice actors