How far along are you with AoA? I'm just about to finish book 4 with my crew. I really haven't been drinking the kool-aid with this AP. Book 5 looks decent, and 6 looks fantastic, but MAN it feels like they just forgot to tell the PCs what the actual plot is, throughout like... the entire story.
Currently running Age of Ashes for PF2e. It's been great so far. PF2e is my preferred system to GM in as it has rules for everything you can think of, which from a GM's pov is great as I can consistently rule the same in each session or in each campaign we play.
Also play DnD5e pbp on a community discord server and I live play Delta Green (Call of Cthulhu).
There are plenty of systems out there to try and I would suggest trying a few of them. DnD is obviously the most popular, but may not fit the type of world / game you prefer.
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