Transfer data from Samsung Galaxy S7 to new Samsung Galaxy S21 5G

Samsung provides a utility on their phones to transfer data between them.  It's called Smart Switch.

Most of your data should be stored on the cloud anyway.  Save your contacts in G-mail, etc.

To transfer data from your Galaxy S7 to a new Galaxy S21 5G, you can use Samsung Smart Swtich or Mobile Transfer software like MobileTrans or Coolmuster Mobile Transfer. They can help you transfer data between Samsung phones directly. About the details, please search online, and choose the one you like better. Hope this will be your help.

You can use Samsung officlal tool or MobiKin Transfer for Mobile to transfer data from Samsung S7 to Samsung S21，they will help you transfer data between two devices directly.

Pretty sure the OP got it sorted out since this is a year old post