What product do I use to renew my leather?
Here's a tutorial showing a product and how to use it. Not sure if it's available in the U.S.
A good saddle soap (available at saddle or boot shops) can be used as well, IF the article is truly leather and not bonded leather. Check an inconspicuous spot on the back or underneath to see what the product does on your specific item.
They make a leather cream. Go to your local farm store and buy it there.
Saddle soap and leather conditioner. If you local stores do not carry, look for a Tack Shop, they will have everything you need.
here is list of top 6 cleaner conditioners for leather... https://mycarneedsthis.com/best-leather-conditioner-and-cleaners-to-buy/ you don't say what/where leather is, these work on all leather goods will change color of some depending on whether it's raw or how treated or coated.