The first search project is your own catalog vocabulary. Model names, product names and the phrases in your packaging are already being typed, and the pages that answer them should be yours. That means product pages written for the web rather than lifted from listing bullets, an about page that makes clear you are the manufacturer, and a support layer covering manuals, spare parts, compatibility and troubleshooting. Those support pages rank quickly because very little else covers them, and they bring in owners who become repeat buyers.
The second project is the demand you never contested. Marketplace sellers usually have no buying guides, no comparison content and no use case collections, because the marketplace handled discovery. Those pages take longer to earn results and they are the only route to non brand organic revenue. Write them from what you know as the maker: how to choose a size, what wears first, what the specification numbers actually mean in use.
Technically the common mistake is importing the catalog wholesale. Listing copy pasted into product pages produces short, repetitive text that competes with itself and with every reseller using the same words. Variants need consolidating, images need alt text that describes them, and structured data has to reflect your own reviews rather than borrowing anyone else's. Where resellers list the same products, canonical and internal linking discipline decides which version search engines treat as the source.