Reddit reviews Arturo Sandoval - Playing Techniques and Performance Studies for Trumpet - Volume 2 (Intermediate)

Arturo Sandoval put out a great Routines book (this one at Amazon:

https://www.amazon.com/Arturo-Sandoval-Techniques-Performance-Intermediate/dp/0793530318

It's based heavily on Arban's book which is pretty much the bible for trumpet technique, but I found Arturo's book a little more accessible, plus it comes with a CD so you can hear what he does. That said, chances are the book you're using has more or less the same routines.

Trumpet is a much more demanding instrument than sax, requiring a lot more consistency in practice to maintain your ability. A good rule of thumb for practice with a balance of practice and fun is:

• 5 minutes of warm up of long tones
  
• 15 minutes of routines (arpeggios, finger exercises, etc)
  
• 15 minutes of fun (reading music, improvisation)
  
  For warm up and routines, you should be resting as much as you're playing, so the above 20 minutes is not a lot of practice... to really improve you're looking at 2X-3X that much.
  
  For fun, buy a fake book which will have hundreds of songs you can learn, and look for play-a-long songs/albums (like Jamey Aebersold's series).