My iPhone 6 plus will not connect to my WiFi

So to confirm... you’ve gone through all of: If your iPhone, iPad, or iPod touch won’t connect to a Wi-Fi network - Apple Support

Does your iPhone 6 plus (or iPhone 6s Plus?) connect to other Wi-Fi networks; are the issues isolated to this Wi-Fi network?

Do other devices connect correctly to this Wi-Fi network?

Rebooted the Wi-Fi network router, reset iPhone network settings, etc?

If everything else is working and this iPhone is not connecting to this or any other Wi-Fi networks, check with Apple Support about your options and alternatives for this iPhone, using the link in the upper right.

Okay, your footer shows iPhone 6s Plus. (iPhone 6 can’t run iOS 13.). After all of the above steps have been tried and maybe after a long-shot restart, seems you’re headed for a discussion with Apple Support.