Just thought I'd throw a thread up to list some suggestions for the server I've thought of while playing for the past few days.
Let me preface this list with this; I know that 1.13.1 is new, very new. I think its the earliest I've seen the server adopt a version.
1. Restart Script. I think it would be a good idea to have a restart script running that was set to restart the server at fixed intervals, say 4 to 6 hours. This could help with the frequent crashes, especially when mods/admins aren't around to reset the server.
I've had this system set up on other servers and it seems to run great. A friends small server even had a webpage you could log in to to manually restart it but that could be abused pretty easily (it totally was).
2. Multiplayer Sleeping System. This would be handy to have, especially with the new Phantoms lurking around. Setting it so that say only 50% of the server needs to be in bed would work out great, especially because sometimes people are AFK and you are forced to wait for them or til morning.
As of now, that's all I've thought of. I'm sure others have ideas too. Thanks for running a great server.