Your art style is not for me (nor do I have any characters you would draw, they're pretty much all in your don't draw list) but I think there's definitely a fanbase for the work you do! (I've seen some successful artists having a similar appeal) You got a clean, charming art style that can be appealing to a lot of people who have the characters for it. There's always room for improvement, especially with anatomy from glancing over it. But it's not bad at all. And your prices are perfectly fine for the quality you offer. Please don't go lower.
How often and were do you advertise? There's always oversaturation and standing out is difficult for most artists. And especially on TH the market sucks anyway. Don't be to hard on yourself, I wouldn't say your style is the issue.