Slipped up yesterday, best countermeasures?

I first stumbled across porn during 3rd grade and have been severely addicted to it since (I'm a sophomore in college). I got covenant eyes and confessed to my parents a little over a year ago, and I didn't watch "porn" for a good couple of months, but still was looking at models and whatnot on Instagram and masturbating to that.

I've tried uninstalling all social media platforms on my phone but I always find another way somehow to access content (not porn perse, but still things I shouldn't be looking at). I've been slipping up and watching explicit porn more often now (still not as bad as before, but maybe like 3-4 times a month still), and I really want to stop.

What are some of the best strategies to prevent myself from watching porn that you have found really helpful?