What are your motivations for quitting porn? Write them out and keep them in your mind. Do you have PIED? If not, try to use that as another motivation because you don't want to get that.
Don't give up. Avoid triggers. If you do see a trigger or start to think about porn, stop looking/thinking about it and take a deep breath (5 seconds inhaling, 5 second hold, 5 second exhale) this has really been helping me with stopping PMO, along with knowing my motivations.
