Claiming your Google My Business or GMB listing is vital for local SEO because it allows business listings to show up in local search results for inquiries related to specific products and or services.
According to Moz,
It is terrible news to those who want to claim their GMB listing to rank high on local SERPs, but don’t worry, there’s an excellent tool that can help.
Blumenthal’s Category Search is a free tool that lets you find local categories associated with a keyword.
To get the proper business category for your GMB listing, type in a category in the search field and check out the results.
For example, if you own a marketing company type “marketing” in the search field, and the site should show you this:
Next, go back to your listing and add or update your business category with the right keyword, or sometimes, keywords.