When someone searches for a plumber and you show up anywhere but the first page of the map listing it's like you don't exist. The customer is never aware of you and never calls!
Correcting this is not too difficult. There are 4 things that will improve your ranking.
Google My Business Accuracy is very important. You need a complete and full listing with hours, location, services, phone number and website.
Your city name and your search category should be in your SEO Title. This will help Google identify you.
High authority backlinks to your website such as Facebook, Bing, Yellow pages, Yelp, etc.
Add GEO tagged photos to your GMB listing and post a couple times per month.
This should give you a big boost. If you need help feel free to call us.