Can you post photos of the damage and include photos of any new scratches and marks?
Does it boot correctly and does the camera/gimbal work?
Are you good with your hands and are you up to doing some soldering? I assume it is out of warranty.
If it is just an arm break they are fairly easy to change but you are probably looking at buying an arm and moor complete rather than just an arm, especially if it is a front arm, and either second hand or pattern or canbalising a bought for parts drone.
DJI don't sell such bits to the public and the repair centres are not allowed to do so.
The biggest problem for 'simple' DIY repairs is not noticing other damage.