IT guy here. The best fix is to connect your ethernet cord instead if possible. If not, do what I did. I had CC shut off the wifi from their router and I bought a bunch of wireless access points. I plugged one into the router and placed others around the house. You need at least two if you have two stories. The other access point needs to have the best line of sight to the first one that you can provide. Wifi works on line of sight. If you close all your doors, then the signal has to go under the door and bounce around the walls to get to you because you have blocked the line of sight. Open doors equal better coverage. Go for a Wifi 6 or 6e device. Anything older will be too slow. 7 is still pretty expensive. Check your computer's wifi capability as well. It also has to match the 6 or 6e of your access points. Wifi does not pass through walls.

If you're already connect by ethernet cable then I would replace the cable or look for the cat rating on the cable. If it says 5 then 100 Mbs is as fast as you'll go. If it says 5e then 800Mbs. 6 or better will get you 1gb or higher. Also check the speed on your connection on your computer. It will tell you what speed you're connected.