9 Future of the story

I've always wanted to work on this story, but I was stuck with Overgeared System. But now I have some time. So here are a few questions I want to ask.

Do you mind if the action is fast-paced and brief? Like not that epic like Overgeared.

How big should the harem really be?[ Like a cap limit,] Remeber you can choose any girl for any world.

How long should the MC stay in each world until it gets boring?

How do you want the MC to improve? Should he be more chill and laid back? More shameless? Lol.

Do you want some kind of romance?

Also do you guys like the cover art? Or should I change it?