Check that your primary category matches your main service, every service and service area is listed, your hours and phone number are right, recent photos of real jobs are on the profile, and you reply to every review. Then search your main service and town to see where you appear.
Categories matter most. The primary category should describe your core work as exactly as possible, with secondary categories for the rest.
Compare your name, address and phone number with your website and the main directories. They should match character for character.
Look at the three businesses above you in the map pack. Count their reviews, photos and how recently they posted. That gap is your to-do list.
Useful pages
This is one part of a bigger picture. Local SEO services in the UK: the full guide covers what local SEO includes, costs, timelines, agencies and red flags in one place.