I found a setup with two main servers and a themed hub world. There is a modded All The Mods 10 server that is meant to be a forever server and it was just set up. It has voice chat and keep inventory is on for newer players but it can be changed if most people want pvp.
There is also a clean vanilla survival server. It has voice chat and it supports Java and Bedrock crossplay. They are adding plugins and they are open to suggestions.
On top of that there is a vanilla Adventure Time themed hub with an Adventure Time spawn you can explore. It also has voice chat and Java and Bedrock crossplay. It works as a fallback for the vanilla server.
The owner says it is 24 7 uptime with smooth performance and active support. For the vanilla servers there is ViaVersion so you can join on any Minecraft version.
