You've got the AF15 as your crown jewel, so you should be happy about that. After owning one I stupidly sold it for what seemed like a huge profit at the time but, alas, it is becoming increasingly further from my grasp as the days move on. I may settle for a nice looking restored book in the future.
I went through something similar to you for a number of years, actually. It wasn't until the last six months that I once again had a focus and discipline to hunt for a run or specific comic. I've noticed that I prefer the thrill of the hunt rather than the trophy in the end. Being an undisciplined collector brought me little joy - more of spontaneous buys rather than a methodical approach to collecting. I would categorize it as impulse buys. Bottom line, don't lose the drive - each book contains a story and has a story, so keep making stories.