I know it's not necessarily the most popular idea but... Sites like Upwork and Fiverr are great sources of alternative income. Most of it is more technical work, but there's a lot of categories.
For example, you could do voice-over work or even animation/artsy type of things. Outside of that, you could try opening up a shop on Etsy, if that's more your speed. It all really depends on your skill-set.