Once you disassemble, the existing soft parts will no longer be useable.
Once dropped, you most likely ended up with a bent frame or shifted motor. This may not be fixable by yourself.
P2s arent that expensive and its probably a more economical solution to just buy a new sub.
If you want to try and fix it just for fun, take a knife and start cutting the surround and spiders and pull out the cone/coil assembly so you can assess the damage. Then go from there.