Ethernet and Networking Problem Solving

So, recently, my family update our internet. The router was moved to the main floor of the house, but my PC is in the basement. I can’t move the PC or run any wires through the walls, but also need fast speeds. If I were to go wireless, I would need to go through 3 concrete walls and a floor. I really don’t know what to do at this point o get internet as fast as I would like (250+ Mb/s). Our current router outputs about 1 Gb/s if connected via Ethernet. Thanks in advance for your help.