I found this server that feels like old Minecraft and it is called WillowMC. It is a semi vanilla server made by some friends who decided to open their private world to everyone.

The main thing here is classic Hunger Games. It is made to feel like the golden age of Minecraft with the kind of survival games people used to watch on YouTube. They have old style maps that were saved by the community so you can run around places that feel super familiar.

It does not look super flashy or over the top. It just feels simple and focused on playing Hunger Games and having fun. If you miss that era of Minecraft and want to jump into matches with other players this server fits that vibe really well.