Before assuming Google reduced your LSA traffic, check your account data for changes in impressions, leads, budget, service areas, job types, and ad schedule. Also compare your current performance with the same period before the drop.
Look at your competition and local search demand too. A drop in leads may simply mean fewer people are searching for your services or competitors are becoming more active.
Also check for recent changes to your profile, reviews, verification status, business hours, or responsiveness. If everything looks normal, compare lead volume and visibility over several weeks before deciding that Google itself caused the decline.