I want to design changes in opencart store

I have opencart website and have installed eMarket- layout 24 themes.

My website: http://mumeshop.com/health-store/

Currently, I have installed the theme :
https://themeforest.net/item/emarket-the-ecommerce-multipurpose-marketplace-opencart-3-theme-mobile-layouts-included/20843842

So I want to website like https://www.healthkart.com/
color combination, font, banner, slider, etc

so experienced opencart developer need. please let me know your minimum cost.

Thank you