Tremolo is not a technique. It is an effect produced when a certain type of arpeggio is employed.
The fluent and graceful arpeggio suggests a free spirit.
When practicing arpeggio patterns at a new level of less tension you will notice how you fatigue more easily than before.
Obviously the same rules apply to arpeggio playing where the motions are slightly magnified.
Extend the range of scale and arpeggio practice.
The second difficult section in Fur Elise ends with an arpeggio containing three PSs: 123, 135, and 432.
This goes for all arpeggio exercises: Never aim for speed.
What is arpeggio?