REVAGE is a multi mode Minecraft server with mini-games, PvP, and a few unique custom game modes mixed in. It has been online since 2020 and has already reached a peak of over 3,000 concurrent players, so there is always something going on.
It supports Minecraft 1.8 and newer, and you can jump between BedWars, Duels, Fireball Fight, LuckyWars, Gun Game, Build Battle, and Speed Builders. If you want something more relaxed, there is also SkyBlock, Survival, and My Little Farm.
My Little Farm even has monthly prizes of up to $200 for the top players. Add in server-wide voice chat, custom mechanics, and plugins, and you get a server that is easy to play solo or with friends, whether you want to compete, progress, or just mess around for a bit. Friendly staff are part of the package too.