Your Shopping listings are disapproved, limited, or telling Google the wrong thing (used gear marked new, missing GTINs, prices or stock that don't match your store). I find every cause in your Merchant Center and your Shopify feed, fix it at the source, and lock it with feed rules so Google's auto-updates can't flip it back. You get a short before/after list of every item changed. Fixed price, written scope, no call needed. Send your store URL and I'll name the first problem within hours.