One RP that I've wanted and tried to do a long time, and which I've never really gotten to do has been simple "trapped in MMO" and MMO-centric stories. I've had RPs where another person is avid gamer for sure, and stories where a character is isekai'd to a world of a game with or without some game-mechanics as well, but not one where there's a blend between real-world and MMO-world together (Shangri-La Frontier or Bofuri for example). Now that my active-gaming arc has once again begun and that the aforementioned Shangri-La Frontier is getting second season romantic, adventure- and action-filled story in MMO/JRPG-esque world is something I find myself craving.
Also since SAO: Alternative GGO is also getting continuation: A roleplay in the world of SAO (original Aincrad. Not any Alfheim or Alicization BS) or something similar would be absolutely fun to do. Trapped in MMO + "you die in the game = you die in real-life" setting would be interesting to play whether or not based on any existing franchise or not.
Also since SAO: Alternative GGO is also getting continuation: A roleplay in the world of SAO (original Aincrad. Not any Alfheim or Alicization BS) or something similar would be absolutely fun to do. Trapped in MMO + "you die in the game = you die in real-life" setting would be interesting to play whether or not based on any existing franchise or not.