Which industry(s) to target in marketing?

Target new businesses who havent called anyone yet. Give them a competative quote. Tell them who your existing customers are and when you visit them and how often. Let them compare for themselves. When you show your interest and eagerness in thier faces they will remember you. And most likely call you if thirr has been a good repore built with every potential customer. 9 years at this but learned this early, my business background helped out a lot too.