Business side of photography

So I’ve made almost 20,000 dollars this year taking portraits and shooting events.

I’m happy with the outcome for the year considering I have a 9-5 and am only shooting on the weekends but I want to keep the momentum up going into the new year.

Is it unrealistic to think that I can continue to generate revenue and business from local strangers just looking for family portraits? What are some suggestions to upscale my business? How do I go from 20k to 40k and on?

Would love some insight.