Replied to you in the Discord, but both links are in my profile here too.

You should be fine.  Fantasy and SciFi are both very popular here.

There are often several RPs going in the worlds of...

Elder Scrolls
Harry Potter
The Witcher
Lord of the Rings
Warhammer Fantasy
Warhammer 40K
Fallout
Marvel or DC Comics

There are also often some original settings in the SciFi or Fantasy genre. 
Particularly in the Pen and Paper section but also in Advanced/Casual there are sometimes Dungeons and Dragons or Pathfinder based RPs.

I have not personally seen one yet but likely before too long there will be a Starfield RP if you are interested in that.

And as always if you don't see an RP set in the setting you would like it can't hurt to write up an Interest Check and start up your own.