internet speed (Wi-Fi) infinitely slower on PC than on phone

as the title says, for some odd reason my PC alone between all my devices has slower wifi, and i dont mean by some meager amount, i mean on my phone its 120mbps and on here its like 15-35mbps, which is NOT normal, because it used to be able to get close to 100, just have no idea why its like this right now.

is there some sort of software fix to this? i cant connect an ethernet cable, as my PC is in my room while the router is outside in the living room, and it cant be connected discretely.

i tried doing things on CMD, doing things via device manager, anything. Nothing seems to work, and its killing me