Continuing Motivation

I will hit day 19 today. I’ve been perfect so far, but, starting yesterday, I looked a little longer at the bikini girls on the insta than I should have and it got me all ramped up. I didn’t seek it out but I did look longer than I should have. I’m not counting it as a relapse as I didn’t seek it out and it started there, but just a bump in the road to my progression. Perhaps it’s more of a fork in the road, where it could be the stimulus to go back full in, or help teach me how to find my motivation to quit again, when I don’t feel like it. How do you guys renew your motivation to quit? The feel good motivation of deciding to quit was gone for me by day 3. I just keep doing good because I decided to, but my discipline is burning out and I’m tired and falling back in is seeming more and more enticing. How do you who have been successful for long periods keep up the motivation? How do you handle bumps like this? Input is appreciated.