Okay, so this isnt an idea, its a suggestion for the people that will be writing Multiverse stories.
The reason why I think multiverse stories suck is because the characters get way too op too quick. By the time they reach their second world they are already strong enough to destroy planets with their sneeze.
In order to fix that, you should make the MC only take one ability from the universe they find themselves in.
For example. If your first world is Naruto, and lets say you get reincarnated as an Uchiha, you can decide to keep the sharingan when going to the next world however you will lose everything like Chakra and jutsus, so when you arrive in the next world your only special ability will be the Sharingan.
Then from the 2nd world you also get to keep one ability and so on.
I dont know if this will fix the problem of super OP characters but I hope it does because whenever they reach the second world they are already the strongest being most of time which I find a little bit annoying.