I wanna know hot to upgrade my cyma c040d

I really want to upgrade the internals of my gun to get higher fps, rps, and a super short trigger pull, but I'm somewhat new and don't know what parts i should get to upgrade my gun. I don't wanna ask Google because most of the time it's unreliable (giving false answers to questions and things like that) if yall need info on the gun i can give it to you guys if yall ask in the comments. Please read this i need help and it would be very much appreciated. Thank you!