RebelsMarket.com is a marketplace for alternative fashion. We have hundreds of sellers who have listed thousands of products. Over 90% of the items do not generate any sales;  and about 40% of the products have been on the website for over 3+ years.

We want to cleanup the catalog and remove all the old listings  that older than 2years that do not generate any sales.  What is the best practice for removing thousands of listings  an Ecommerce site? do we 404 these products and show similar items?

Your help and thoughts is much appreciated.

We are an e-commerce marketplace at for alternative fashion and home decor. We have over 1000+ stores on the marketplace.  Early this year, we switched the website from HTTP to HTTPS in March 2018 and also added noindex and nofollow tags to the store about page and store policies (mostly boilerplate content)

Our traffic dropped by 45% and we have since not recovered. We have done

I am wondering could these tags be affecting our rankings?