There will be no direct way to migrate this site to the Website Builder platform. Based on the design and functionality of your site, I also don't believe it will meet your needs.
You may want to consider a WordPress/WooCommerce combo or using a dedicated e-commerce platform.
I am a GoDaddy End User - Just Like You * Please note that I offer free advice on this forum. I DO NOT answer private messages. Please ask your question in the proper forum so the answer can assist EVERYONE in the community and not just you. Thanks! *
Once your issue is resolved, please be sure to come back and click accept for the solution