Does someone know how to create google reviews in Google Maps without a warning or risk?

I have a client who wants to enhance his presence in Maps..

Of course, you can send a message to old clients asking to leave a review, but still not something you can control.

How many reviews does your client currently have? The reason I'm asking is because if they have dozens of reviews already, you might be able to get away with purchasing reviews from a seller. Of course, you might be aware of some chatter about many of these services not being able to leave reviews that stick over the last year or so. In my experience, there have been a few that have worked, but only on listings that already had a bunch of reviews in the first place.

Other than that, try asking friends and family or other people who might be local to the business.