Once you have your account in creator or business mode, follow the below steps to see who shared your posts to their instagram stories.
How to see who shared your instagram post 2021. Go to your profile and click on the post. Tap on your profile icon placed below and select the post whose. To view the people who have shared your instagram post in 2021, you will need to open the post and click on the “share” button.
Go to your profile area where you can see all the posts you have posted. Click on the post you want to check who shared it.