The first deliverable on any search engagement here is a written record of where you are: every indexable URL, its status, title, description, canonical, headings and structured data, plus whatever Search Console history exists. Captured before a single change ships.
That is partly so the work can be measured honestly. It is mostly so that nothing gets destroyed. The fastest way to lose rankings is to rebuild a site and quietly drop the pages that were earning, which happens constantly and is usually discovered a quarter later.
We do not promise positions. Nobody can, and an agency that does is telling you something useful about itself.