I started to write a response to you and found that I'd written an entire post that would probably benefit others too. Don't take a break, do more research! You're lacking in marketing, I do believe, and that is up to you when you're self-publishing. If you'd like to read my response, you can find it in my profile, but if not, that's alright. I'm not trying to promote myself here, just give you food for thought. Research your target market, and ways to market to them. Amazon is NOT going to do that for you, unless you pay them to. Your books were up for maybe 12 hours, then they went under a whole pile of new books. You have to market them to keep driving them up the ladder. :) Find me if I can answer any other questions for you.
RE: Is there any point to keep writing?