WIX Site Aspect Radio Resized

I need an expert developer to restructure my existing WIX website. The site is currently not loading correctly on tablets and desktops/laptops, and requires adjustments to stay within screen boundaries.

Key Requirements:
- Fix layout issues on most of the pages
- Maintain the current design while ensuring correct aspect ratios and resolutions on all devices
- Resolve issues with page going over the side

Ideal Skills and Experience:
- Proficiency in WIX
- Strong understanding of responsive design
- Experience with cross-device compatibility testing

Please provide examples of similar work done and your approach to testing changes.