Set up Apple Search Ads ASO for my iOS App

Looking for an Apple Search Ads expert to review and properly optimize our app campaigns. We want someone to check our current setup, improve or rebuild the campaign structure, handle keyword research, match types, negative keywords, bids, and budget allocation, and make sure everything is set up properly for a small test campaign. The goal is to get the highest possible number of quality app downloads with a test budget of around $400 over two weeks. We are not looking for generic marketing advice. We need someone with real hands-on experience in Apple Search Ads who knows how to work efficiently with a small budget and can make practical decisions based on performance. Please apply with a short explanation of your Apple Search Ads experience, examples of similar app campaigns you have worked on, how you would approach a $400 test budget, and when you could start.