Justin Whang's Youtube is a great way to spend your free time if you have no other ideas.
AI art is another great way to spend your free time and a personal hobby of mine.
You can also make AI art here.
I highly recommend ChatGPT Plus, it's extremely useful for many things (including HTML for lazy people like myself,) and it comes with Plus for Sora Image.
If you're going to make AI images you may want to modify or fix some that either don't come out perfect or aren't exactly the way you want it. I recommend Pixlr and PicWish to help.