Install a Medieval MC [FORGE] - MMC4 server through the Control Panel (Servers → Select your server → Game servers → Add Game Server → Medieval MC [FORGE] - MMC4)
Easy to use interface (Yes, even for beginners.) with plenty of tutorials available and great uptime. No complaints here. It works great for me and my friend.
Vanilla MC but w/ mcmmo. Spigot 1.20.1 server.