Terralith is a datapack that adds over 85 brand-new biomes to your world and makes it feel like a different game. It is my absolute favourite world generator and no other world generator gets close to this in my opinion. RealisticSeasons has build-in configuration for all Terralith biomes and makes sure each biome has the most fitting season effects and temperature possible. Install Terralith and run the command /rs install Terralith once. Fully restart your server and you are good to go.