How many cold calls with prospective customers do you have daily? How often do you talk to people who might be interested on LinkedIn or other professional forums/social networks? How often do you attend in-person professional/networking events, conferences, tech talks? If you're not doing that at least few times a week, your odds are very low.
I used to build like you, do SEO and marketing, etc. But people buy from people - it's about trust. I got my first client after I finally took the phone and started calling - had to do it for 3 weeks (hundreds of calls, ugh) but it worked out. I got my second client when I went to my ~15th professional event. I had a big streak of luck on my ~20th event - 3 clients after one evening. I'd never get to have this kind of luck if I didn't try 20 times.