Hit the ground already running.
A 60-minute kickoff call where we establish three things: what you're trying to accomplish (and in what timeframe), what's been tried already (and what the results were), and who internally is going to be my primary point of contact. Then you grant me access to your accounts — Google Ads, Meta Business Manager, TikTok, LinkedIn Campaign Manager, GA4, GTM, and anything else relevant. By the end of Week 1 I'm inside everything and starting the audit.