You find out what matters to you by noticing what you’d do for free.

Pay distorts the signal. Anything you do for money comes with reasons that are not your own, so it tells you little about what you value, whereas things you do with no reward attached are chosen for themselves. Watch what you drift towards on a free Saturday and you have a fairly honest account of your priorities, including some you would not have listed.

Keep track for a fortnight of what you do when nothing is required of you. Not the scrolling, but the things you actively choose. Then take the one that recurs most and give it a real hour on purpose rather than in the gaps.