You could consider getting into drawing/design. They compete incredibly well against the display-based tablets made by wacom, especially these days where you can also do 3d and animation in procreate.
If I was starting this as a hobby, my first step would not be to spend several hundred dollars on a tablet and pen. I'd probably grab some sketchbooks and pencils first for <$50 and see if it sticks for more than a month.
If you aren't into drawing, what about music? You can download GarageBand for free and it's pretty great once you figure it out.
Or if you aren't a music person, are you into making movies? Final Cut Pro does have a subscription, but it's only $5 / month and the subscription is easy to start and stop. If your needs are simple, the free iMovie is pretty good.
Or maybe video isn't your thing. Are you a writer or poet? There are a lot of great choices for writing apps and the battery life of the iPad means you can work away from your desk all day.
Or if you like writing software, Swift Playground is fun. I found this to be a great resource:
If you are into photography, Affinity Photo is fun. It doesn't have the AI features that Photoshop has, but for amateurs, it can get you pretty far. Plug in an external drive to your iPad and you can use it with a huge photo library.
Drawing with undo, layers, gradients, transparency, and infinite brushes is very different from sketching on paper. I don't think a sketchbook is anything like it.
Just borrow someone else's underused ipad if you want to give it a try.
I mean yes, but if you have an incredibly impressive machine compared to SOTA 10 years ago just lying around, I'd have fun with that too. :)
Plus you can use it for more "practical" stuff like logo design or editing or even just note taking... I wanted to provide some examples of not just youtube machine.