About porn addiction, and any addiction actually, you shouldn't try to go on a streak of days.
The goal isn't "I will not do it this month" because then if you relapse you'll easily give up.
The goal should be "I will do it the least I can this month", it should always be your goal, don't count the streak of days and think everytime you do it it's a failure, instead count how many times you did it this month or this week and try to reduce it (or bring it to zero).
The important thing to change is your mindset, most people think they are giving up something when they quit but you must be convinced you're not giving up anything, because unlike what a lot of people say porn has ZERO benefit, it's simply useless and you're not giving up anything, when you have an urge just laugh at your own brain because you know it is an illusion because people who never looked at porn never feel the need to look at it, because no-one needs it.
And if you keep failing and failing for many months just be patient, if you get negative about it it will get worse, stay positive.