Our old engine couldn't cope anymore, and I decided to switch to WooCommerce. Everything would be simple, if not for the huge product database and order history. I started doing it manually - and quickly realized that it was a dead end. I studied information on the Internet and found a useful site https://www.shopping-cart-migration.com/supported-carts/4418-woocommerce . There are both tips and an automatic migration service. At first I didn't believe that it would work, but everything was transferred without errors. A useful resource.