I found a small network with two main servers and a hub that is Adventure Time themed. The modded side is an All The Mods 10 forever world that is brand new and meant for long term play. It has voice chat and keep inventory is on for newer players. They said it can be turned off if most people want pvp.
There is also a clean vanilla survival server with voice chat. It supports Java and Bedrock crossplay. They are adding plugins and they are open to suggestions.
The hub is vanilla too and it works as a fallback server for the vanilla world. It has an Adventure Time spawn you can walk around and explore. All the servers are hosted by the owner and they aim for 24 7 uptime with smooth performance and active support. The vanilla servers also use ViaVersion so you can join on different Minecraft versions.
Adventure Time Hub With ATM10 Survival
Olympia Towny PVP – Custom Enchants & Epic Fights
Olympia Minecraft Server
Welcome to Olympia, a fresh Towny PVP server with jobs to make money and cool enchants to use in battles! The spawn is themed with items to buy and places to explore or roleplay in. The staff are super nice and always ready to help. Join us soon and have a great time on the server!
Hope to see you there!
51.195.208.29:25567