Users keep getting timeouts and disconnecting OR can't do anything (mine blocks, walk..) from my server

Running Paper 1.17.1, latest build (385) as of now. I had the timeout problem, but after setting the socket keepalive timeout to 2400, users just are really lagged. Physically we aren’t that far away from each other, ping speeds are good (<15ms). Timings: Aikar's Timings Viewer

I really don’t know what’s the problem. I can connect to the server fine (it’s not in my internal network), 2 players can connect to it fine, but others just can’t. They can connect to other servers just fine, but not to mine. Really bugging me out.

I also noticed that when using a VPN to my phone (somewhere like USA (running the server in Slovakia) I can’t join, and it doesn’t even get shown in my logs)

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