Lag?

Hi!

So I have been playing in my aternos server for a long time, and it recently started lagging real bad. I have spigot 1.15.2 . It usually says ''cant keep up! is the server overloaded'' or something like that. I went back to vanilla and again to spigot. Neither vanilla nor spigot fixed it. Can someone help me? Ty!

Dont worry it was my WIFI. idk how but when i logged on the server it lagged real bad. i restarted my router and its okay! ty