So you want to be a fast bowler well here is the secret

Pitch the ball up as far as you can to pass the splice of the bat

The great fast bowlers had this ability

McGrath
Lillee
Thomson
Willis
Holding
Roberts
Garner
Akram

The indecision from the batsman on whether to go back or forward creates poor shot selection as you can’t drive off the splice of bat.

Bowlers no matter how fast, if you bowl knee down you a flat bowler and it’s far easier for the batsman to drive.

So there you have it, work on the seam position, come over the top and pass the slice of the bat.

Good luck