I keep on crashing even though theres nothing wrong with my internet

I keep on crashing even though my internet is good. I'll be on a call with my friends and then we'll join my server, but as soon as i finish loading it i crash. The message that disconnects me says something like "You were disconnected by the server host", i can't really remember. It's usually only around night when it crashes though. I assume its a server overload kind of thing? But even so, my friends have perfectly fine connection. Sure, tps and fps will drop here and there but it doesn't disconnect them. I know for sure its not my internet because on everything else, my internet is really good. Its just aternos. I live in Japan. The server is on 1.16.5, im not sure if you need that information but just in case. I wanna know how I can fix this and stop being disconnected.