I do consulting. 99% of consulting is persuading prospective clients that they need your consulting. Not that there's something wrong with it, but I am not that good at it...
Sounds like you're freelancing on your own? Maybe consider going to work as a consultant for a firm where somebody else manages the sales and admin stuff, and you can just do the technical side? That's the way I work, FWIW. The downside is that I don't have total control over what I'm working on, and I probably make less money than what I could make doing it on my own. But I don't have to worry about sales, book-keeping, etc. (Of course, I have to do that stuff for my side-project company, but that's a separate story).