Do you lay your wrist back on the takeback, such that your racquet butt is facing the direction you want to hit the ball? Do you it the ball in front of you, rather to the side of you? I have found that by doing these two things and hitting through the ball more, I can hit a more powerful forehand that goes deeper into the court but still has plenty of topspin.
I don't like "point the butt at the ball" as a consious thought. It does happen, but better to think prepare for hit by getting racket head up above wrist. Almost all pros get the racket head higher than the wrist and many get it almost directly above wrist. From that position, it is a matter of looping to the bottom of the ball and then following up, thru and across to opposite shoulder in a CONTINUOUS and accelerating motion. The wrist layback and butt pointing at ball happens during the continuous loop and I don't think you want for think about it or force it into your swing. Look at lockandroll instruction on youtube on forehand and backhand. Racket goes back above hitting hand. Forward swing starts, hips and shoulders rotate forward causing looping action of racket head, then follow thru. If you grips are relaxed the butt toward ball position is fleeting and fast and just a single phase of the loop.
To hit topspin shots deeper, you can try these things:
1. hit higher with your normal spin and swing.
2. hit less spin by flatening your upward arc a small amout. Nadal flatens his swing when he goes for the aggresive forehand vs the loop&grind forehand.
3. increase your swing speed with a relaxed but faster motion.
4. get a heavier racket (hi-er SW) as more mass behind the hit will produce more force as long as you don't slow your swing down.
5. be sure you are rotating the hips and shoulders into the ball. Sometimes the opposite shoulder actually goes backward as the dominate shoulder rotates forward. Think finish strong with you hand above or beside opposite shoulder. Sequence thru contact point is hips, shoulder, hands, and finish strong - this is a kinetic energy chain. Watch Fed forehand and see how smoothly coordinated the rotation is with each body part in perfect unison with the next.
6. You also want a bit of knee bend and knee lift in the kinetic chain so the lift of the legs happens as part of the unwinding of the hips, shoulders, and hands.
By the way, I couldn't see your grip but something south of an eastern forehand or a semi-western should be fine for topspin. A full western is too limiting for me but some like it.
That's about all I have learned in 35 years to generate more depth.
