If you have never tried a cross sharing program, you may like to try Vendoo. They offer five free posts to see how you like their platform.
Here is my referral link for Vendoo:
I have an Etsy store which I do not plan to cross-list most of my items, however, I have a Poshmark store and decided it would be a good idea to add Ebay and Mercari to future items posted on Poshmark. I tried adding Ebay and Mercari in the past but the program I was using did not have the capacity to take down the item sold from the other apps. Now, Vendoo offers this feature. I'm thrilled. I started using Vendoo for the items I sell on Poshmark, Mercari, and Ebay in the middle of December. In the past, I tried selling duplicate items on several platforms but never gave it long enough to work. This time, I have committed to giving this app a fair chance for success. In the last few days, I have sold two items on two different platforms and without any problems, Vendoo removed the items from the other platforms where I had the items for sale within minutes. It is working seemlessly.
If you would like to sell the same items on multiple platforms, please give Vendoo a try. I believe you will like it.