I found a long term survival multiplayer server that is meant to be really hard and intense. It is hardcore style where dying gets you banned for 12 hours so every fight matters.
It runs on hardmode and natural regeneration is turned off. That makes food and healing super important and it feels more like a real struggle.
The server has a small group of active players right now. It also has a few MMO style things like skills and collection tracking but it is kept very minimal and mostly just quality of life.
Ghouls SMP Hardcore Semi-Anarchy Survival

GG.MINEWIND.NET New Server IPMineHub 1.21.9 Minigames And PVP

MineHub is a Java server running on 1.21.9+ and it is built to feel smooth and stable. It is made for people who like to compete but also for players who just want to hang out and build.
The server is focused on custom coded minigames plus pvp action. There are also different game modes including survival and a community hub style area.
One big part of MineHub is collectibles and cosmetics. You can unlock handheld items with custom 3D models and also wear custom hats. Items come in rarity tiers like Common Legendary and Seasonal Legendary and there is a collection log so you can track what you have.
The community is described as active and friendly with regular events and a non toxic vibe.
GG.MINEWIND.NET New Server IPGHOULS Hardcore Semi Anarchy Survival

This server is a long term survival multiplayer place for hardcore players who want it rough.
It runs on hard mode and natural regeneration is turned off so every fight matters.
When you die you get a 12 hour ban so you have to play smart and not rush.
It also has minimal MMO style stuff like skills and collection tracking for competition. The skills are kept small and mostly just quality of life.
GG.MINEWIND.NET New Server IP
