Before I start, you don’t owe anyone any specific way to spend your time. Don’t feel like you need to spend time constructively. It’s ok to do nothing.
That being said, reading is always good, or you can pick up a hobby to develop new skills. It can be anything from knitting to woodworking. Life is packed with shit you have to do that you don’t necessarily want to. If you have a choice, pick something you enjoy. It’s ok to drop something you don’t enjoy. Sell or give away whatever supplies you bought, and find something else.