I have several friends and acquaintances who started off as coders in C++ for audio-video applications. I also know a few who do websites and all that jazz. They all went on to develop a specific product or range of services.
Or as Henry Ford put it "Find out what the customer wants and give it to them!"
Customers start with a market place and existing products. sim[ply put -
If you want to attract new customers, offer them something they need.
The thing is, they don't actually need a developer. What they need is the thing that the developer develops. If it is an audio SW package, you advertise on audio forums and websites like Sound-on-Sound and Gearslutz. If it is a video package, Creative Cow and similar places are for you.
And so on.
If you want to become fabulously rich, I have a tip. Combine coding with an interest you have that is badly serviced by existing SW packages. Enter into the Coding Hall of Fame one Justin Frankel.
Justin (born '78 in Arizona) began coding in C at about the age of 12 and wrote in in-house email app for his fellow school mates. He dropped out of university after six months, as he realised that he knew more than his lecturers about C++ and all that stuff and within months had founded his own small company (with a friend) which he called Nullsoft. They had one product - an MP3 player called Winamp. They then created another small product called ShoutCast that turns a computer into an internet radio station.
After turning Winamp into a music creation and visualisation package, Nullsoft was sold to AOL and Justin's share was shares to the value of $60m and a job that paid well. He stepped out of line by releasing a file sharing app called Gnutella and he was fired in 2004.
Now rich and independent, he turned to his other love, making music and tried CuBase and ProTools. "I can do better than that!" he thought and began a project that he called Reaper.
To cut a long story short, Reaper is today the third most popular professional audio SW after CuBase and Logic and is (IMO) far, far better than anything else out there! ProTools is still loved by Hollywood, but even the BBC uses Reaper.