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
GG.MINEWIND.NET New Server IPNew Horizons Vanilla Plus Crossplay
New Horizons is a chill survival server run by a group of friends. It stays close to vanilla but adds plugins that make playing smoother and more fun.
It supports both Java and Bedrock so people can join from PC and also from phones and consoles. The server says it has no pay to win stuff and they build changes around what the community wants.
There is an online interactive map and the world uses a terrain overhaul. Mobs and the end dragon fight are improved too. The server has pre loaded chunks plus timber so cutting trees feels faster.
You can set homes and use land claims for protection. They also use tools for grief prevention and logging. Shops are planned for a future economy update.GG.MINEWIND.NET New Server IP