We need a multi layer isekai setting at this rate, like someone whose been isekaing but can't stop, someone who was like a mob character and is now some main character but their original self is still there and someone who is doing first isekai. Then add in like some insane isekai big bad who has also been stuck. Then everyone dies and ends up in next layer. Overarching theme would be cosmic horror but strangely enough set in otome games.