Need an action plan on this local map pack scenario

Hi SEO pros.. Need an action plan on this local map pack scenario. I have new client who wants my help with ranking in the Google map pack.... He stated that... They were in the top 3 and just last month their GMB lisiting was suspended (they used a virtual address) I know a dumb move specially when Google has been working on cleaning up the maps as shared my Tim Capper however they removed their address and submitted the listing for review and it was reinstated by Google but they lost the map pack rankings and also all their reviews were deleted. They waited for a month to see if it ranks back but nothing happened. So, they sent emails to clients to leave reviews and got a few reviews but still not ranking. I checked on their citation score and it was above 80% on Moz and also on Yext scan. All info is perfect on the GMB lisiting as in images, posts, info., category etc. They do appear in the map on position 8 for the search term but that money pack spot is gone. So, at this stage I am a little stumped on what the strategy should be to get them back in the map pack.