I suppose you have already setup google analytics at your ecommerce website. If so, continue reading, else setup same instantly which is off course free from google.
Now analyze your site's visitors pattern, sources, exit pages etc and then try to identify why visitors is exiting your site without any purchase.
Optimize each exit pages with complete and detailed information about your products and services, optimize title, description, header tags, alt tags etc, which will reduce bounce rate and improve conversion too.
For further information and professional assistance you can contact https://mysticwebdesigns.com/digital-marketing/