After actually watching the video, I'm agreeing with ATP100. Don't think about specific changes to your forehand at this point. There are no major problems. Just practice a lot with the idea of learning what you have to do to hit harder and lower, or put more spin on the ball, or loop the ball higher, or hit a short angle, etc. Don't go overboard and start flailing about, but work on specific improvements. Takebacks, racket head drop, etc. should develop naturally as you learn what you must to to achieve these things.
Post another video or, even better, have a pro look at your strokes in a couple months and see where you are then.