I had a good thing going and then I totally screwed it up. I had shopping ads going with a solid ROAS (6-7x - solid for me anyway) over the past few months, and then I just had to go revamp my whole product structure in Shopify as part of a site rebuild. Basically we still sell the same products but changed the entire construct on the back end for other reasons, in the process we purged the products that were in the feed. The worst part is I, a not very smart individual, also killed/removed my existing campaign and started a whole new one, because what could go wrong with a fresh start? Well every KPI is in the toilet, impressions/clicks are way down (90% or so) and just for fun costs are also way up (? ). So, anything I can do or do I chalk it up as a lesson learned and start tweaking/optimizing my way back to glory?