The things I like to collect are audio equipment (mostly audiophile headphones and ear buds), plushies, metal EDC pens, collectible books, and wrist watches. I used to collect vintage game consoles and music CDs, but I sort of stopped doing that.
All the wrist watches I want that I don't have are either ridiculously expensive and I'd have to have a very nice job, or they all share the same watch movement. The mechanical device that makes a watch tick is often the same among many watches because there's monopolies on manufacture of watch movements.
I have a few plushies I kind of want but I have no more room.
The problem I have with books is that all the books I want now are a few hundred dollars, which is ((ableist slur redacted by mod)) expensive for a book. So that's sort of off the table.
The one pen I really wanted is discontinued, and the other ones I want are easy to get and there's only a few more.
I like collecting and I'm not sure what else to collect. I could just go buy nice clothes, I dunno.