Promotion comes easily to a lot of tattooers. When I first started tattooing, I was shy, a hermit. I disliked talking to people and pretty much felt uncomfortable in my own skin. I did not, and do not now, have great social skills and an outgoing personality. I also have always been a geek, nerd, dork. A skank. A weirdo. Not popular.
Promotion requires friendliness. You have to like people, to convince them that there is good reason for them to come to you for their visual needs. Yes, skill and talent and innate genius go a long way, but not all the way. You have to learn to shake hands and smile. To play nice.
I discovered, after tattooing for a few years, that I genuinely liked the people I was working on. Tattoo clientele vary regionally of course, but I found that even the “worst” client base were people that I naturally thought were pretty cool. They wanted to get a tattoo. Often they were witty, or silly, or just interesting. I decided I liked these people.