I lost motivation : / any tips?

Sup r/loseit, So after 5 or 6 months of keto and 80ish lbs lost I just lost my motivation :( I stopped going to the gym and starting eating badly again and I no idea where it came from. YES I know that losing that amount of weight should give me motivation in it self but I dont know what to do. Im back to the whole Ill start tommorow mindset. Any tips for getting back into the groove?