My server is not starting propperly

So just yesterday I tried starting my server, when I did it oddly wouldn't let me or my friend join. I figured "The problem is probably temporary" and tried again later that day, It did the same exact thing so I decided to try again "tomorrow" (Which is today) and it did the same exact thing.

The server would start as it should but every time me and my friend try connecting it will take a long time logging in till we time out, then when I try restarting it it cant find the host, and soon after it automatically shuts down.

I have no idea why, hopefully this problem is a problem with a plugin or aternos, I want to keep the world, It has days of work on it.

McVersion: 1.11.2
ip: poco2.aternos.me

Quote from Roman

Seems one of your plugins is hanging on the login process.
Try to uninstall plugins one by one to find out which plugin causes the issue.

is there a way to delete the plugin and not the config/data files, do I just delete the .jar versions of the plugins?