There are a lot of fantasy-themed RPG assets, but not a lot of sci fi stuff. Maybe some modern/sci fi top-down RPG stuff? Space ship interiors, tech, aliens and alien worlds, etc. That could be fun.
Not immediately. I've been working on a 2d top down framework for a little while. Rogue-lite open world sim kind of thing. Still not 100% decided on the theme yet, but I've been leaning towards Fantasy just because I'm not an artist and those kinds of assets are plentiful.