There are several good online places, as well as Ebay, EBSQ (do a search on Google), and Deviantart.com. Tese are all good places to start and the are either free or low cost. Also, doing art and craft fairs is a good way to get your art out there.
Usually, if you get your art out enough where people can see it, you will eventually sell something!
You could creat hubs about your artwork and upload pictures of it. I think creating a website/blog with a paypal account would be great! Then ass a link in your hubs here to your website!
That would be considered a back link as well. :).
Etsy.com is a great resource for individuals looking to sell original artwork, crafts, and home made goods.
As you have already sold more 200 artworks in past ,continue with the medium of marketing you are in right now.
If you are interested in selling online you contact ebay.com, etsy.com , gallerytoday.com.
Art Exhibition can also be a great way to sell your art .
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.