The Manti does is not ASTM compliant, and ParaZero discontinued their PRS. Unfortunately there are now no longer any PRS available for the Mavic 3 Pro.
As others have said, yes you have to register it.
Can you sell your photos? It depends.
If you're going to go out and fly to get photos for sale, then yes you need your Remote Pilot Certificate (a.k.a. 107). If someone reaches out to you after...