Set up mobile view for Shopify store, drop down menu for various categories to shop from. Need email subscribing listing modified so new subscribers can receive emails

I am looking for a Shopify expert who can help me set up the mobile view for my store and create a drop-down menu for various product-based categories. Additionally, I need assistance in modifying my email subscribing listing so that new subscribers can receive emails.

Requirements:
- Experience in optimizing Shopify stores for mobile view
- Knowledge of Shopify's theme customization options
- Expertise in creating drop-down menus for different categories
- Familiarity with Klaviyo email provider for subscriber list management

Skills:
- Shopify development
- Responsive web design
- HTML/CSS
- JavaScript
- Klaviyo email marketing

If you have prior experience in Shopify mobile optimization, drop-down menu creation, and Klaviyo integration, please submit your proposal.