Improving the shoplify website speed optimization

Hi. We run an online store on Shopify. Our website takes a lot of time to load on web and mobile. When checked with Shopify team, they answered as "Based on the data I see here there are some improvement that can be done on the theme code. It will be best asking the experts about how to improve the site speed"

I'm looking for Shopify experts who have knowledge in improving the load speed with necessary changes.

Thanks.