The only way to resolve suspension issues is by checking all policies and ensuring you comply. Google will not give you specifics.
Here is my list: https://community.shopify.com/c/Ecommerce-Marketing/Checklist-Suspended-Google-Merchant-Center-Account-Fix-amp/m-p/1086444/highlight/true#M39128
And I recommend reading:
https://support.google.com/merchants/answer/6363310/follow-the-merchant-center-guidelines
https://support.google.com/merchants/answer/7052112
https://support.google.com/merchants/answer/4752265