Three map slots will not carry a practice whose clients live in four counties
The local pack rewards proximity to whoever is searching, which is exactly the wrong axis for a federal practice in a metro with no center.
Local results are generally weighted by where the phone is standing. An office in Buckhead shows well to someone searching from Midtown and fades badly by the time the search comes from Gwinnett or Cobb. You did not lose that case on quality. You lost it on geometry.
Immigration is federal, so you could have represented that person regardless. The listing is not deciding who you may take. It is deciding who walks in.
Keep the Google Business Profile clean because it does real work: brand name searches, hours, directions, calls from people already close by. Accurate categories, a working phone number, photos of the actual entrance. It costs an hour a month.
What the listing will not do is rank you for case type queries across the metro or reach the family in Alpharetta comparing three firms at once. Nothing in the pack scales past the drive. Fund the content library with the budget you were about to spend chasing pins.