Server Can't Keep Up! Keeps Crashing

Hello! Aternos has been amazing and provided me and friends a great place to play together. We worked super hard on a server and for some reason have not been able to get in for the past few months. Every time we log on the server says "[Server thread/WARN]: Can't keep up! Is the server overloaded? Running 97597ms or 1951 ticks behind" and then the program freezes and then we get kicked off.

Cant anyone please help

Here is my log: https://mclo.gs/7wNbCPN

Hey Bluewy I looked into that article and tried some of the advice and it didn't do anything. Any other guidance?

What do you mean using that version - what version should I set to the server?