I have a few collection pages that are ranking and getting traffic for a keyword but the product for that keyword has been discontinued and not available anymore. I don't know if I should redirect that collection page to the replacement, change the keywords/products on that page, or if I should just keep it as is. What are your thoughts?
I'd rework the page to say it's unavailable and you recommend these alternatives because of x, y, and z reasons. Gives you opportunities to build internal links, keyword stuff, and make your site look well maintained.