It’s good periodically to change the action title name, preview, but do not change the information about the item. Just add more images, delete some old that doesn’t looks good. Create a good video preview and video tutorial and put links in the description. Make updates monthly to your best actions. Share them in reddit, facebook groups and pages and your item will get trend. 
Just a simple example: My item is uploaded 1 month ago and it was trending about 5 or 6 times and every time it was trending i got 5 sales per day. Also it’s rated now with a lot of followers for a brand new account
Regards,
GifCreator
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