Your solo games sound very fun! Genesys and Star wars is very cool. I have the Genesys book on my shelf but never got to run it, maybe some day. I only played the Star wars system with the similar narrative dice on a convention a long time ago. It worked pretty well, I thought it was pretty clear with all the symbols, just had to get used to it. Only downside is having to buy the dice or printing stickers. The dice symbols and colors are very satisfying though. I very briefly read through Ironsworn, with the intention to play it as a group GMless game, but did not really understand how the group is supposed to make the decisions about what happens next. Maybe it is because, like you said, it originated as a solo game.
I'm planning on two solo campaigns, one with EDGE Studio (originally Fantasy Flight Games) Star Wars RPG. A mix of both Edge of the Empire, Age of Rebellion, and Force and Destiny further down the road. But I plan on running it during the Old Republic era. I quite enjoy playing the SWRPG/Genesys system. I know the narrative dice is hard to get behind for some people but I prefer it. It feels a bit more transparent what you'll get, plus it's fun to roll a lot of dice so there's that tactile aspect to it too 😁
The second campaign is with Ironsworn: Starforged. I actually want to use this solo game as a basis for my web serial that I want to write in the near future. The system is built with solo play in mind, but it can be played co-op or guided by a GM. IIRC, the original basis of the system was PbtA, heavily modified. Ironsworn was what introduced me to the concept of playing a TTRPG solo! Which was awesome, considering my previous experiences playing a TTRPG with a group keep falling apart for one reason or another...
I also want to try City Without Numbers, the cyberpunk variant of World Without Numbers and Stars Without Numbers. I backed it on Kickstarter and sorta waiting for a slightly more complete version before I dive in. Again, it's something I plan on running solo as well...
I am considering a play-by-post game, likely with the Ironsworn: Starforged system. Largely because of the nature of PbtA games, which tends to give and encourage more agency to players. Plus the support for running it co-op means ideally, no one is relied on as the GM, constantly having to respond to a player's inquiry or action before anyone else can move forward.
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