PROJECT - Google Ads Deep Dive, recommendation, implimentation, handover

I am driving sales to my eCommerce business, spending around $200-$300 per day on ads, generating between $1000-$2000 in revenue per day. I have a large inventory of largely similar items of around 4000 sellable SKU's that include various pack sizes and combinations. I have been using offshore staff to maange google ads as I didnt know much about what to do. Overtime I have become reasonbly familiar with the operation and decided that the team I was using were very low skills and trained and were not achieving results. In the last two days average CPC increased signifgiantly dropping my exposure and dropping sales. I think its as I am migrating from Smart Shopping to Performance max, plus i added some key words. I now think there is too much overlap and I am driving up my own CPC. Need an EXPERT, with great experiene to conduct a deep dive, recommend a smart strategy then commence delivery of the main aspects then handing over the remaining work to me and the team