Reset your Network adapters, see if that helps.
Settings, System, Reset Options, Reset WiFi Mobile Bluetooth.
Also check out additional possible solutions at the link below.
How To Fix Common Wi-Fi Problems In Android
Go to Settings > Wi-Fi & Internet > Wi-Fi > Wi-Fi Preferences and enable "Turn on Wi-Fi automatically" and that should fix it.
I can see from your screen shot this is disabled.
If you are facing any problem while connecting wifi to your mobile network. You can again turn on the router. If still not connecting then:
● Go to settings
● Click wifi and internet option
● Select wifi
● Choose the network
● Select the Forget option to remove the previous setting of the network
● Then again connect the same network by giving the password.
Your wifi will be connected within seconds. If you want to know more check this website indexblogger
Wipe cache or reset wifi settings.
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