Welcome to the Q&A Forum

1. Ok so I code my eCommerce site myself first 2. Then switched to Shopify and re-direct all my URLs  (terrible mistake) 3. Then Shopify didn't do in terms of seo, so I switched to BigCommerce and re-direct all my URLs (Yes I know but at least this platform is much better) I started getting 404 errors as you can imagine in webmaster tools after switching from Shopify and there were 504 of them. Why its too many because I realized that Shopfiy just creates so many urls for the same pages. One by one I re-direct them to their new destinations. As you can imagine my rankings dropped. As my site speed is now 5.5s at gmetrix. mobile 47 - desktop 80 on Google Site speed tool. Looking at the links now, some of the 404's does not make sense to redirect. How should I approach this? Should I remove some of them if they were not used on web anywhere, no sites linking to that page and let them die in time? OR Should I keep them all? I am giving some examples below, there are so many for each. Thank you all! /account/login/ /blog/?page=7 blog/tagged/recipe /blogs/news /blogs/news?page=6 /collections/all/category-name /collections/frontpage/category-name /collections/frontpage/products/product-name /collections/shop/category-name /collections/shop/products/product-name /product-name/ /pages/terms-privacy /pages/frontpage /products/product-name /shop/products/product-name