Attractive Shopify Homepage Revamp

I already have a Shopify store, but I need an experienced Shopify developer/designer to make some improvements and modifications.

Tasks include:

Improve the overall design and make it look more professional.
Fix layout and alignment issues.
Improve the homepage and product pages.
Optimize the store for mobile devices.
Improve navigation and user experience.
Fix any bugs or design issues.
Make the store clean, modern, and ready for customers.

Please share your Shopify portfolio and let me know your estimated cost and delivery time.