Yes. An agency can usually take over an existing Local Services Ads account without starting from scratch. They can work with your existing profile, reviews, service areas, account history, and performance data rather than creating a brand-new campaign.
But before the handoff, make sure you keep ownership and access to the account. The agency should review your current setup, lead history, budget, verification status, and past performance before making changes.
Starting over is generally unnecessary unless there is a specific account, verification, or policy issue that requires a different approach. Keeping an established account can also preserve valuable historical data and existing customer reviews.