Okay, with the right phone tagged and your pictures I think there's a fair chance you may be able to recover from this. It looks to me like the phone broke in a line between where the battery and the motherboard meet and from what I can tell I think the motherboard may be intact.
If that's the case, then your best bet would be to pick up another phone of the same model that's got an FRP lock. Remove the motherboard from your phone and swap it over to the new phone.
Your existing phone appears to be a total loss. The screen is obviously dead, the midframe is toast, from the looks of the flex cable connector the auxiliary board is a wreck and I doubt I'd trust that battery. So yeah, salvage the motherboard and the parts with it like the cameras and sensors and move them all to another chassis.
I'd say your next step is to go ahead and pull the motherboard and verify that it's intact. Here's the guide to follow to pull the board.
[guide|148811|Samsung Galaxy S21 Motherboard Replacement - iFixit Repair Guide|new_window=true]
I'd say to follow it up through Step 36; I see no reason to remove the cameras; just transfer them along with the motherboard to the new chassis.
Once you get the motherboard free, post some pictures of it and we'll see if we can spot any damage to it that might keep you from being able to do a successful transplant.