Read the report before arguing with it. The three things that most often produce a low number are a comparable pulled from a weaker pocket of the city, a floor area copied from an old file rather than measured, and basement development the appraiser never saw. Each of those is a factual error you can correct with a document rather than an argument.
The reconsideration goes to the lender, not directly to the appraiser, because the lender is the client. Attach two or three genuinely comparable sales from the last 90 days with dates and addresses, plus permits, invoices and photographs for the work that was missed. Vague statements about the market being strong carry no weight and will not move the file.
Timing decides whether any of this helps. A reconsideration takes days, and your financing condition has a deadline, so the request has to go in immediately rather than after a week of deliberation. What prevents the whole situation is a listing priced on documented improvements in the first place, which is what Joel Dyck's hand-reviewed valuation is built to produce.