As others have pointed out, there doesn't seem to be much in the way of resources for DAs looking to become more secure. For new members looking for guidance, here's a thread to compile what we know about what has worked for us in terms of becoming more secure/ overriding our defence mechanisms. So please add any knowledge or experience you have that may help others. Even if it seems obvious or basic, it can be helpful; remember many are only just discovering this about themselves.
If it was therapy, what type of therapy? How long did it take? Did meditating, psychedelics, talking to parents about upbringing help? How about consciously overriding commitment-phobia ie brute force method?
As your post has discovered, few DAs are looking anywhere for guidance besides inside of themselves, within the context of fierce independence. It just 'is' and unless a DA is also Anxious, it seems this is a very lonely thread. Darn it all, it would be enlightening for sure to hear from someone about their experience. However, here is an article, 2 parts, that may be helpful or enlightening to DAs if they ever wander upon this thread