I'm and old player and game master of role playing games (from at least 1990). From 2021 I started to play online on discord and roll20 too. I played about 1600 hours in about 4 years. The server where I play (Blood Manor Games) have about 2000+ players inside and I've an half a dozen of veteran players that like to play my games. I always liked Saber Rider and the Star Sheriffs, than I'm working to do a RPG companion pdf for Fabula Ultima and its supplement Techno-Fantasy. Four of my veteran players are already available to play the short campaign of Saber Rider and the Star Sheriffs that I'm planning.
The Fabula Ultima RpG include rules to play almost any background. It's possible to use the Techno-Fantasy supplement for many sci-fi settings. I used it to play the OAV background of El-Hazard, the Magnificent Word (I even did a book and pdf for this setting), the Master of the Universe, Knight's & Magic, Slayers and Ronin Warriors. Fabula Ultima it is even available in german and english language but the creator is italian.
Here the links to the Fabula Ultima RpG in german and english language:
https://ulisses-spiele.de/game-system/fabula-ultima/
https://need.games/fabula-ultima/
While here a screenshot on roll20 of the tokens/miniatures and map I will use to play the RpG online: