Ultimately, does a particular diagnosis or set of diagnoses matter?

Some are fixable, some are manageable, some "it is what is it". I think if I can get a good grip on what's going on, I could do a better job sorting it out. I have made some improvement with an assume all of the above approach as CBT is a overlapping treatment for all, but I would at least like to know I'm going in the right direction. Any online testing I tried shows trauma for sure, but the others may or may not be an issue, but that overlap makes it hard to figure out.