your cable company may be able to help your relocate your modem.
Upgrading from wireless to wired is one of the bigger upgrades you can make.
Many try to justify it because wireless is so much more convenient but it can’t support high end streaming.
I will add that my modem is only 15 feet from my system but there is no way to get a wire to the system invisibly because of doorways etc. I have a multi hundred $ mesh system. Finally I just ran a test cable across the room to compare wired with a generic ethernet cable to my wireless. There was such a big difference that I left it across the room until I could run something more permanent. It shows, but it is worth it.
Jerry