Well done on the 53 days!!
I went to SA in the past, once a week and managed to stay sober for just over 100 days but was full of lust thoughts.
Now I do a mindfulness meditation for addiction app every day and have a taphsic neder and have been sober for 90 days. I am able to control my thinking much better and, with the help of Hashem, am lusting way less. My phone has no filter on it at all.
I have transcribed much of my program over the last couple of months, over here
guardyoureyes.com/forum/2-What-Works-for-Me/327296-Sholoms-Mindfulness-Recovery-Path
So far I have found it necessary to have a rigorous program and that recovery needs to be the main focus of my life. On the other hand once I have really changed, maybe I wont need to spend quite so much time and effort. I will have to keep up the mindfulness practices but the plan is they will eventually become a habit and 2nd nature.
For now I'm not sure that I need the 12 step groups but I read the big book from time to time. A lot of the yesodos in there and in the white book are invaluable. For example, the idea that the addiction is to lust, even thinking, not just acting out and that in order to stay healthy we have to stop lusting altogether, is absolutely fundamental.
The 12 steps are more known and most people who have recovered have done so through the 12 steps. However many shmutz addiction therapists that I know have switched to using mindfulness from other methods of therapy like CBT, so I think that there is potential for mindfulness to become a viable option to recovery from shmutz addiction.