Shopify Store Desktop Optimization

I'm in need of a Shopify expert to optimize the desktop version of my store, tienda.cosacuriosa.com. I want it to look as sleek and professional as https://theglowfilter.com/. The current layout is too large and needs to be adjusted to be more visually appealing and user-friendly.
DO NOT WANT TO CHANGE MOILE VERSION
Specific Tasks:
- Adjusting the layout of the entire site to make it look good on desktop
- Resizing and repositioning the navigation menu
- Ensuring the site is responsive across different screen sizes (only for desktop mobile version is fine)
- Adjusting the spacing between elements for a cleaner, more modern look
- Changing the arrangement of sections, if needed

Ideal Skills and Experience:
- Prior experience with Shopify, particularly in desktop optimization
- Proficiency in responsive design and layout adjustments
- Strong eye for detail and design aesthetics
- Ability to deliver a clean and professional final product
- Excellent communication skills to understand and implement my requirements