Shpify Website improvement

We need the following enhancements to our website

Link - www.petterworld.in

1. General speed improvement & SEO optimisation eith Meta keywords etc

2. Implement multicurrency logic - implement differrent prices for different countries that is automatically shown based on location the website is accessed from (auto IP detection)

3. Product page improvement -
i) show vertical carousel of product images
ii) extra product options - free or paid
These product options can be made free through discount coupon or offer

4. Direct Add to cart of products fron collection page (only for single variant products)

5. Options to show discounts & offers on Cart page to choose from.
Also, discount pop up if auto applied

6. Product Page - show color variants as separate products

7. Collections page - show specific collections only

8. Mega Menu implement with pics & mobile responsive

9. Add custom product reviews and show them on product page & home page

10. Implement loyalty & referral program along with wishlist & affiliate

11. Show bundles & related products on product page

Please note that some of these functionalities have already been implemented. Please review & get back on the same.

Also, we are looking for as less paid plugins as possible. It would be great if you could implement the via liquid programming