Shopify On-Page SEO Optimization

I need an SEO expert to enhance my Shopify site's performance, aiming for an 'A' score on Pingdom.com. Although my site is loading faster, the current performance score is lower than I'd like.

Key Requirements:
- Focus on on-page SEO: refine content, keywords, and meta descriptions.
- Initial optimization priority: Home page
- Specific improvements: Content optimization

The ideal freelancer should have:
- Proven experience with Shopify SEO
- Strong skills in on-page SEO
- Ability to improve site performance scores

This is an urgent task, so timely delivery is crucial.