Yes, get out of your office, and make some cold calls in person. Letters get thrown away, emails deleted, meetings canceled. Grab some of your best samples of previous jobs, put together a price list, make up some well designed business cards, and target which customers in your town you want to sell to. Get out & knock on doors, print up some sample shirts with a great company design for your company to leave behind, and pull some doorknobs.
Also, check w/ other screen-printers & embroiders in your area; as they always have customers that want the type of orders that would work well on a
DTG. Perhaps you can offer contract
DTG printing. That's how we grew our 23 year old business, by cold calling.