@Jewels I have a Redbubble store but I haven't seen any action from it (this is probably my fault for not putting more effort into marketing and new designs). But keep in mind that based on this experience I think the chances of people finding you organically unless you're popular is slim.
That said I've found their interface easy to use, you can choose which products you offer your art on and even change the art to better fit certain products. You can also change the price so that you get more per item if you want but take into account you normally only make approximately a 20% profit on sales.
There are also two types of POD. First you have ones like Redbubble and ImPrint that do everything for you. Then you have others like Printify and Printful, these are still POD but don't provide you with a platform, you use them in connection with your current online store, such as Etsy. The pro of the first is that you don't have to have a store and if you build enough traction you can get people finding you through them. The pro of the second is that you can connect it to your current store if you have one, that the quality is better and the profit margin tends to be higher (at least based on Youtube reviews I have seen)
I've started looking into the second option but I don't have any experience with it yet.
I hope this helps