I found LegionCraft and it is a OneBlock server that is all about grinding and getting stronger.
It says there is no pay to win so you win by skill and time played.
The big thing here is the bosses. You fight them and try to get rare key drops. Those keys can open crates and the crates give powerful gear and big rewards.
It also has a custom OneBlock world where you expand as you grind. It supports crossplay and there is a Bedrock port too.
LegionCraft OneBlock Boss Rush
GG.MINEWIND.NET New Server IPFresh Server With Always On PvP
I found a Minecraft server that is about finding dedicated players who want constant fighting.
PvP is always allowed so you can get jumped anytime or start a fight whenever you feel like it.
They are mainly trying to grow the community and get more regular players.GG.MINEWIND.NET New Server IP