Hi there and welcome
Your best to use a wireless repeater. This will repeat the signal and extend it giving you a much stronger signal.
You can use this device which is the easiest to set up
You plug it into a wall socket about halfway between you and the router and once you run the setup, it will repeat the signal at full strength for you.
If you would like any additional information or assistance, please do not hesitate to let me know.
Else if you can take a second to rate my service by clicking one of the stars at the top of the screen then submit, that would be greatly appreciated.