These are some recommended plugins, you can use them for free for your server.

Hibernation, to reduce lag - https://www.spigotmc.org/resources/hibernate.4441/

EssentialsX, to enable basic commands, good for moderating your server - https://www.spigotmc.org/resources/essentialsx.9089/

ClearLagg, to reduce lag - https://dev.bukkit.org/projects/clearlagg

GeyserMC, to enable java and bedrock players to join your server - https://geysermc.org/

If you want to run Dynmap on your Oddblox server, you might need a extra port to run it. If you require a extra port for Dynmap please create a ticket. Resource: https://www.spigotmc.org/resources/dynmap%C2%AE.274/