Hello @Blv and welcome to the community!
Was there any change if you rebooted your phone to safe mode?
If you check under Settings > WiFi, can you still see your old saved networks or are they gone?
Are you able to manually connect to a WiFi network? To do so, go to Settings > WiFi > Press the three dots > Add network > Enter the required information > Press Save. Are you now able to connect to this network?
