My experiences are much the same as many others....just lucky i realised that stuff don't equal happiness many many years ago.
Im the same in that there is nothing cycle wise I want or need....so for me its tinkering. I find its a great mindfulness generator. I then ride the result for a while...could be a month, could be 2 years, but then i break them up and do something else.....Its all just for shits and giggles really. I've only one bike i wouldn't part with, the rest would go if the price was right....and i believe that's the way to tell if you want that object or not!
I was a biker (motor) for 30+ years, but then found i was loosing interest....so i did the last thing on my list and built a bike from scratch....that hobby is now done....so be it...move on.
I know it sounds odd, but I honestly believe it makes no difference if you spend your time watching tv, on forums, building stuff or curing cancer....from a personal (not society's) viewpoint, its all just buring time till the inevitable end. So, as long as your enjoying it fine...if not, stop and do something you do enjoy before its too late or you loose any more precious time.