What is a new thing, a new something that you have recently gotten into, or that you have been a long time participant in, that you find very entertaining and fun and time consuming and distracting?
What things would we need to purchase to get into that thing?
How did you get into that thing?
3D printing.
Get a used printer or build a new one (building it teaches you a lot about how it works).
Start downloading models… toys, gifts, tools.
Start seeing what little things you can fix and improve around your home.
Encounter something you need to print, but can’t find anywhere to download… Get into CAD and start making your own models.
Also there’s a nice side effect if you get into 3D printing: it’s suddenly really easy for your family/friends to buy gifts for you. There’s never enough filaments you could have.