Fix issue with duplicated items on Meta and Google Catalogue

I am looking for a Freelancer to complete a project for me. I am experiencing issues with duplicated items on both Meta and Google Catalogs. Currently, I need a complete strategy for how to fix this issue. I am open to Database manipulation, Code alterations and/or Data cleanup solutions for this fix. I look forward to hearing from you about what plan you would have in mind to get this resolved quickly and within budget. Thank you for your time!