I don't know what to tell you Bob. You have 555 paintings posted in your gallery and have red dots on 538 of them. Seems to me that you are selling.
I know I've written to you in the past and told you about broken links on your blog, but you still have them. In the right hand column you have Links to three websites to look at your artwork and all three links are broken. Buyers can get very frustrated when they click on a link and it goes nowhere.
Trying to sell art at a low price on Ebay is self defeating and I stopped doing it a while ago. Now I list art on Ebay at a fixed price (my regular price) with the Make An Offer option. I've sold a couple of paintings this way, by taking an offer, with the offers being lower than my asking price, but higher than what I would have listed it for at auction. And you can do these Fixed Price listings on Ebay all day long, without any cost to you, because the listings (40) are free until the piece sells. So there is no reason not to put some of your larger works up on Ebay. It won't cost you anything to try.
You can also try a couple of other websites that are geared towards higher priced pieces. Vangoart.co (which I already told you about) and Saatchiart.com are both set up to sell art for a higher price, but they also take a higher commission (30%). Of course, you're not going to get too far trying to sell 5x7" paintings for $500 on these sites. But an 18x24" or 20x30" go for these prices all the time (and higher). Obviously these sites are NOT set up for the average daily painter.
Yes, doing the same thing over and over and expecting different results is the definition of insanity. I'm wondering if you have a clear idea as to what it is that you want to accomplish. You are selling art, but obviously you're not happy with your results. You posted your first painting here almost four years ago and have consistently sold almost everything you've posted.
Giving up when you have the talent that you do is bogus and the wusses way out. And I mean that in a Tough Love kind of way. I have two of your paintings hanging on my wall and I'd hate to see you give it up because things seem to be hard right now. You have 538 Red Dots on your gallery page. 538 red dots! So you must be doing something right.
From a fellow Las Vegas artist, figure it out and get busy fixing it.