It kind of sounds like OP morphed from hobbyist to investor, then lost interest when his investment lost value.
There’s a lot of hobbies that offer a path to professional, and I’ve watched friends go down that path. It’s rarely a good experience - there’s all kind of things you have to do as a professional to make a living that you can blow off as a hobbyist/volunteer. There’s a lot more stress when success or failure is tied to whether you eat or not. You lose a lot of freedom to tell dickheads to fuck off.
Never been into collectibles, myself, but the investment pressure seems insidious. Like, it’s one thing to trade cards among friends because you got doubles of something your buddy’s missing, but buying a rare card because it’s “underpriced” to hold until its price recovers is very different. The money is pressure to change from looking at your collection as good, fun, or complete and to looking at its presumptive cash value. Then you’ve stopped being a collector and started being a businessman.
I got my current number around 3 years go, and the vast majority - easily 95% - of calls I get are still real estate, political, or job search spam for the previous owner. It’s on permanent DND, but I’ll check the text log every day or two.