This screams "I was written by ChatGPT"
So many errors when loading due to invalid code.
Several lines are commented out using "//" (which is not how Skript works)

Oh and this at the top:
"# Unified JavaScript Skript for Server Management"
Unified JavaScript Skript?!?!?

The restart command tells players to "save their progress"
Um... player's dont save their progress in Minecraft (not sure if you've played the game before)
Also the restart command doesn't even restart, it just executes the stop command.

This is just a god awful mess.
If you're going to post something, at least post something YOU wrote, not a language AI