I've looked at revolt and well, when I tried using it it was filled with less than reputable individuals. I don't remember specifics but I remember noping the fuck off revolt real quick. If you want text chat, try matrix, if you want voice well, then idk what to say other than discord, team speak or guilded. Guilded is pretty cool, I actually like the client way better than discord but my friends all use discord and guilded isn't a huge platform. It is backed by the Roblox company so you at least know it's gonna be supported, but then again, it's the Roblox company...