Brave Browser is a good Internet browser. For the meantime, set it to automatically "Clear browsing data" for BOTH:
Settings >> Additional Settings >> Clear browsing data >> Advanced
and
Settings >> Additional Settings >> Clear browsing data >> On exit
For each of those, ENABLE all the selections EXCEPT "Site and Shields Settings" and "Passwords and other sign-in data"
For general cache cleaning, you might try Piriform’s Cache Cleaner aka CCleaner. Download the free version.
Get a wireless access point that connects to your PC via Ethernet cable, and set it up as an alternate that you can switch to, and test your Internet connection. Find out, if this works better / more reliably, than the USB version.
Use Net Limiter, in order to monitor your PC's network traffic. Become familiar with what is the usual traffic, so you can, in contrast, notice the unusual traffic.
Become familiar with your Windows 10 hosts file; as part of keeping an eye out, for unusual activity. How to Lock, Manage, Edit Hosts File in Windows 10
If you have been using your ISP's DNS servers, try using some free and public DNS servers. Do NOT use those of Google, Cloudflare, nor Quad9.
Brave is my default browser, and I like it. Firefox used to be my go-to back in the day, but now it’s a hot mess. And Cloudflare shoud be declared a public heath emergency.
bkmk
Resetting the Router
While you have an Internet browser connection to your router - in order to administer your router - take screenshots of every settings page. Prepare to perform a complete reset of the router.
If you cannot find your router's manual, try connections in this order:
http://192.168.0.1/
http://192.168.1.1/
http://192.168.0.50/
http://192.168.1.50/
http://192.168.0.5/
http://192.168.1.5/
http://10.0.0.1/
http://10.0.0.2/
Default factory admin username and password combinations for routers:
admin / (blank)
Admin / (blank)
admin / admin
Admin / Admin
admin / password (use that text string)
Admin / password (use that text string)
If you cannot find the RESET button press-in-and-hold time duration, count to 30.
Go thru a RESET with the Power cable plugged in (and all other cables disconnected); and after the router settles down, instead of restoring settings, do the following:
Unplug the Power cable and unplug all other cables. Press and hold in, the RESET button for double the manual's suggested amount of time.
After that, plug in the Power cable and let the router do its thing and settle down. Followed by connecting a direct Ethernet cable between your PC and the router. Followed by you restoring the router's settings. Followed by connecting any other cables to the router.
Make sure that your Local Area Network router has a complex administrative password.
Make sure that NAT is enabled on your Local Area Network router.
If you are able to select a Wi-Fi channel for your Local Area Network, start with Channel 1 and leave it for a while. It tends to be the more durable Wi-Fi channel.
Yet, you may find that you have to keep at the Wi-Fi channel testing, to find the channel that is the more durable for your Local Area Network, given the structure of where you reside plus neighboring wireless signals.
Be prepared to switch to an all-wired connection between your PC and the router, when your Wi-Fi appears to not work (as you stated). In other words, test wired vs. wireless.