The main focus should be new and upcoming games that can grow the community imo...
Fivem or Rust could bring many new members to the community. Rust could be something new everyone could at least try for maybe 1-2 month period to see if it goes well and if we can create a player base. On the other hand, bringing a fivem server back would also be a great idea because of the release of GTAIV coming relatively soon, fivem has been popular recently, especially with the use of streamers on twitch and Kick. Now I'm not sure why the server got shut down in the first place but I just hope we can try something new.