THis is great. I have two Etsy shops that make occasional sales with print on demand items. I also have a Society 6 shop that is much like Redbubble. After 7 years I am making a consistent $100/month but sometimes it jumps up to $200. I also have Patreon and Medium, of course. It all adds up over time but the number one thing to remember is to stay consistent. That is the key.