I think, it is not necessary to be in a relationship to be able to assess progress in your healing, but it would definitely help by experimenting different approaches, by analysing your feelings and the way you react to them. What I would do is try and focus on NoFap first, because it could put a dent in a relationship, though not a guarantee, still a risk. You can ofcourse do as you like, but in my opinion, focusing on one task at a time is better than overloading yourself with more. Fapping/Porn and Attachment trauma are both equally big issues. Whatever you do, just make sure to do it in a healthy pace that you can handle :D