The first step is to make sure that the basic profile is optimised properly. This includes keeping your opening hours up to date, have photos of your business on the profile, and making sure that all services are up to date. 

You can also add posts directly onto your GMB listing. This is good for showing off specials or deals and is an effective way of getting people to view your profile. 

Making sure you are getting positive reviews on your GMB is also something that you should be working towards as this shows trust to people that come across your listing.

To add to the excellent reply by Richard Chalmers, we would recommend that you set up messaging which gives searchers the opportunity to send a message directly from your Google Business profile. With a large portion of searches being done from mobile phones these days, this allows a quick option for connecting with your business.  Make sure you reply to these and also monitor and respond to your reviews.

Also, it is hard when life is so busy, but trying to publish posts and photos weekly as doing these two small things will also enhance your profile.