Raspberry Pi microcomputers can be a great option for hosting your Minecraft world as long as you don't mind doing the work to set it up.

Everything you need to know about making a custom server to play 1.21 with friends can be found detailed below.

How to join a friend's Minecraft world You can join friends in Minecraft via Realms or by playing together on a dedicated Minecraft server. In Bedrock, you can also join a friend's world directly.

Having Java installed and updated ensures your server runs efficiently without compatibility issues. How to Make & Host a Minecraft Server on Your PC Watch this video on YouTube.