Google Ads Optimization for Physical Goods

I'm seeking a seasoned Google Ads expert to improve the conversion rate on my website, worldbestitems.com, which offers physical goods. Despite having run previous campaigns, they haven't yielded the desired results. The main challenge identified has been a poor conversion rate.

Key Requirements:
- Proven experience with Google Ads, particularly for physical goods
- Expertise in improving conversion rates
- Ability to provide a sales guarantee

Please note, I need someone who can deliver tangible results.