I found a OneBlock server called LegionCraft and it is all about building up from your own island and grinding to get stronger.
There are challenging bosses and when you beat them they can drop keys. You can use those keys for rare loot and there are crates with epic gear and rewards.
You can also use chunk hoppers to automate parts of your island. The server says it is not pay to win so it feels more fair if you just want to play and grind.
OneBlock Bosses And Key Loot
GG.MINEWIND.NET New Server IPOneBlock Bosses and Key Loot Grind
I found a OneBlock server called LegionCraft and it is all about building up your island from one block and pushing your progress.
The big thing here is the bosses. They are meant to be challenging and they can drop keys that you use for rare loot.
There are crates with epic gear and rewards so you can keep getting stronger. You can also use chunk hoppers to help automate your island.
It feels like a grind and fight and loot kind of place. It also says it is not pay to win.GG.MINEWIND.NET New Server IP