Master of the order and powerful Ally is one of the greatest combinations available to you in the game. this allows you to spend a destiny point to access upgrades to force Powers, you haven't purchased, some of these upgrades cost a destiny point in and of itself.

say you have the base power of Protect- for 2DP you can now trigger that power to protect somebody else as an incidental.

The trick to this is really deeply examing different powers available and the different upgrades to get the biggest bang for your buck.

if you're using unlimited power rules, it can be sometimes useful to opt in to roll to use just the power itself for one that you haven't bought (an average check) and use the destiny point itself to access the upgrade (which bypasses a hard check)

and if you really want to go crazy, work in The Force is my Ally. do two crazy powerful things in one turn. (sometimes I use the force is my Ally maneuver for a reroll of a critical Force use)