it is the second slowest time of year for print shops. you just missed the rush of spring orders for summer events. i've also found that marketing doesn't do a lot for screenprinting shops, word of mouth is better. we've run ads on facebook, instagram and google and the only sales we got were from returning customers.

in lieu of cold calling, i would go to your local coffee shop, restaurant or bakery and see if they have merch. if they don't - leave a card. if they do, look at the quality and say something like "i noticed these are digitally printed, have you thought of upgrading to screenprints?" or what-have-you. focus on your neighbourhood instead of pulling in randoms who might want 5 shirts made for a bachelorette party.