I cannot use items or blocks like doors/chests.

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    Randomly while playing I noticed I wasn't able to use certain things. I cant open doors, chests, barrels, all that. I cannot place blocks, however I can break them. Sometimes I can attack people and sometimes I cannot. I looked at the console. and I noticed "[Server thread/WARN]: Can't keep up! Is the server overloaded? Running 2031ms or 40 ticks behind" I believe this could be apart of the issue but I am not 100% sure.

    "[Server thread/WARN]: Can't keep up! Is the server overloaded? Running 2031ms or 40 ticks behind" means that your server is lagging. Maybe because your server is lagging your not able to place blocks and many other stuff. Take a look at this article https://support.aternos.org/hc…rticles/360027350792-Lags

    None of it seems to help sadly. I cant use papermc because of mods, there are minimal mobs, not any items on the ground as far as I can see either. I did the tickspeed thing and that didn't help either. It could be because of chunks but even when I'm the only one on and not loading any new chunks, I'm still having issues. It started happening just randomly during gameplay so I don't think it is related to any mods. I hadn't messed with mods for like 7 hours at that point when the problems started. I don't use a modpack, my internet is stable as far as I can tell because I can go onto other servers and use other apps just fine. And I don't have the ability to pay for more ram right now so im not sure what to do.

    which server software and version do you use

    Maybe try installing performance mods on your server

    Try installing these performance mods