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Try resetting your Network Settings via:
Settings | General management | Reset | Reset Network Settings
You could also try resetting your phones cache partition if the above does not help, as this is sometimes required after an update.
Hello Zanitor2924, Welcome to the Community. We understand how frustrating it is when you are unable to use Wi-Fi on your phone. Since resetting the settings, Safe Mode, and clearing the cache partition has not helped, the next step would be a factory reset of the phone. https://www.samsung.com/us/support/answer/ANS00062029/
If the Wi-Fi will still not turn on after the reset, it is recommended to have the phone serviced. You can use the following link to find a list of service centers in he U.S. that can do the repair: http://www.samsung.com/us/support/service/ or by contacting customer support at 1-800-726-7864.
For assistance outside the U.S., please use this link: https://www.samsung.com/us/common/visitlocationsite.html