You’re Too Far From Your Router
This sounds a little too obvious, but it’s possible that you’re connection isn’t slow, and you’re just too far from your router. Yes, it sucks, but there’re are a couple of ways you can fix this issue.
Again, it might sound too obvious, but a quick solution is just to move your router or yourself closer together. If possible, try to be as close as possible to your router so you have the best connection possible.
The other option is to buy some Wi-Fi extenders. They’re usually not that expensive—or at least cheaper than a router—and you’ll only need one or two to strengthen your Wi-Fi connection throughout your whole home.