You might have the best service, products, goods and if the world doesn't know about it, your best service and product is of any good. There is a strategy call "multiple advertising" which help your service to be known by different peoples.
How do you practice the multiple advertising strategy.
It simple you'll post your goods, products on different sites like.

www.adsclap.com
www.olx.com
www.jiji.com

Check for buying and selling groups on Facebook post your ads there and sit for a potential customers to contact you.

I'LL RECOMMEND www.adsclap.com because you can see number of people that have seen your ads, Google map integrated for direction to deliver your goods or services.