A Local Services Ads account may not immediately return to its previous level of impressions after being reactivated. Lower visibility can also be caused by changes in budget, business hours, targeting, competition, bidding, eligibility, or account status. Google confirms that LSA visibility depends on multiple factors, including budget and competing advertisers.
If your account was inactive for an extended period, don't assume that simply reactivating it will restore its previous performance. First check whether the account is fully active and approved, your business information and service areas are accurate, your budget is sufficient, and your required verification remains valid. Google also notes that screening and verification status can affect whether an LSA can appear.
If impressions continue declining, review the account's current eligibility, budget, ad schedule, service areas, job types, and competitive environment rather than treating the previous impression level as a guaranteed baseline.