Can your cellphone connect to 5g in your room? 5g can not penetrate as many walls so it could have problems gettings signal.
Also USB type wifi sticks dont have the best range.
Where do you have the adapter plugged in? It should be between your PC and the router, thus if your PC is literally between the usb card and the router then your PC itself could be making it harder for your usb card to get a signal.
Also try a usb extension cable to see if moving it upwards above yoru desk helps.