Hi and welcome to the community. 
Not a techy, but posted a couple of topics with troubleshooting actions dealing with wifi connectivity problems that might help you resolve your issue. Posted the links below. Also, make sure your Brave and OS are updated to the latest versions. Current Brave version is 1.38.119.You may need to tag the moderators after troubleshooting to see if they can help.
Brave Browser Wifi Connectivity Issue (Wifi works on alternative browser)
Brave stopped accessing WiFi - WiFi still works on Chrome!
I hope these can help! Please post an update. 