@AetherEgo I started#RPG with the originalWhite Box back in the 70s, but #SoloRpg didn’t seem to exist as a separate thing until recently. I tried #Mythic and some success, experimented with #RisusRPG and others that really need multiplayer interaction.
#KenWickham, #PartsPerMillion, and later Mythic helped a lot and taught me I could play almost any ruleset solo.
True joy for me came with #PbtA and the 'move' mechanic. The most recent boon is #Zoser and that approach.