Shopify customised theme, product update and optimisation for conversions

New more user friendly customised theme for Shopify site that improves conversions. Make sure shopify is optimised for conversions and has the relevant apps configured as we are getting traffic but not enough conversions. Product updates required and design to improve buyer trust. We would like to close our old website and just use our Shopify site.
Please see https://watt-to-wear-print.myshopify.com/
No time wasters, need this turned around in a week as contracted PPH individual has gone off work sick.