After being stuck the bigger part of this year with unstable 5-10 Mbit/s Internet, I am glad to report that I finally took steps towards a (temporary) solution 🤩
This is only possible because I am drawing a 25 meter cable from my living room, up the stairs to my office.

The initial idea is to lay this cable outside the walls of the house.
But the more I think about it, the more I think I will only place nice cable ducts the entire way and keep the cable there.