For me right now, it's books followed shortly of watching things. And I mean watching things that isn't YouTube. Recently, I've been donating totes of books, books I've spent a long time having thrifted for and waited to get without having to cave to spending online.
And those books just sat there for months and months without being picked up to be read. Even books I wanted! I used to have a 5-shelf bookcase filled with books, another 3 shelf filled with books, a structure compromising of a shoe shelf and TV-stand filled with books. Now after donating things, I am only down to a single three-shelf bookcase just packed up with what books I have decided to remain with me.
As for watching things, I've discarded over 120+ DVDs from my collection, I still have a hefty amount, like I have nearly 5 full disc books filled with discs of a wide variety of movies and shows to watch should I ever not be online or want time off from being online. All just continue to sit there unwatched as I just keep watching YouTube video after YouTube video.
I just think I am coming around to the acceptance that I just will not give myself time to these hobbies and that they're probably dying out, I predict that if I don't do anything in the next couple years should they all sit and gather more dust, I'll just let them all go.