Google Ads ROAS Optimization Expert

I'm seeking a Google Ads expert to optimize our Google Shopping campaign for my digital product store. Our account is over 4 years old with significant spend, and our primary goal is to improve return on ad spend (ROAS).

Key Requirements:
- Optimize existing Google Shopping campaigns
- Improve ROAS
- Manage a well-established account

Ideal Skills & Experience:
- Proven track record in Google Shopping campaign optimization
- Expertise in improving ROAS for established accounts
- Strong analytical skills to assess and adjust strategies
- Experience with digital product stores is a plus

Please include past work related to similar projects in your application.