It starts from the numbers. Before any recommendation, the consultant should rebuild four figures: contribution margin per order after shipping, discounts and returns; repeat purchase rate; payback on paid acquisition, channel by channel; and stock cover by product line. A revenue dashboard can't answer what those four can.
It names one or two constraints. A long list of improvements isn't a strategy. The work should identify what is limiting growth right now (thin margin, weak repeat buying, cash stuck in slow stock or acquisition that doesn't pay back) and build the plan around that alone.
It ends in a 90-day plan, not a deck. Every action gets an owner, a date and a measure you can read in Shopify or your finance reports. At day 45 you should be able to tell whether it's working without phoning the consultant.
It depends on what you hand over. Expect to share Shopify analytics and reports, access to your ad accounts and email platform, a monthly P&L and inventory by SKU with cost prices. If a usable P&L doesn't exist yet, building one is the first job, and it may be a bookkeeper's rather than a strategist's.
Sometimes strategy is the wrong purchase. A store without enough sales history has nothing to analyse yet, so spend on launch and traffic first. And if everyone already agrees on the plan and it simply isn't getting done, you need execution capacity, not another plan.