All of my interests are obsessive and fluctuate in intensity
For some reason, I seem to get focused on one thing I like at a time. Like, I like a lot of things, but more often than not do I focus on only one of those things and become complete obsessed and engrossed in it for a few weeks to a month.
It's not like I completely abandon the thing once my obsession fades. It's usually replaced with another one and comes back maybe a year later, and I can still enjoy the other things I like, but I keep going back to my current obsession.
It's sort of like clockwork. I forget about one thing only for it to come back a year later and completely envelop my mind.