I remember somewhere that someone wanted to know how to get customers. I had a thought- offer to bake for a fundraiser at your child's school. You know they have fundraisers or fall festivals or such. Bring your business cards to hand out if someone admires your work.
Take cupcakes or small cakes to the bank, drs office, hairstylist, ect.
I offered to make a b'day cake for each person at the bank I delt with. I would make a single layer 8" round. Can do similar with any place you frequently deal with.
I got three 8" rounds from each cake mix. Not a big investment Of course, that was 15-20 yrs ago when prices were much lower.