Question:
Any advice on how to become a real "baal mofeis" ("miracle worker")?
Answer:
Very simple: Just keep a list of all the things that you davened for/worked on bitachon (reliance on Hashem) for and got, and forget about all the times that it "didn't work," and before you know it the line will be out the door! Says the Brisker Rav z"l: You want bitachon? Just review your own life's stories, all the "brick walls" that Hashem broke for you, and all the times that Hashem saved you from "hot soup"!
And of course a little Shaar haBitachon doesn't hurt, and with a niggun.
But above all: menuchas nefesh habotei'ach ("calmness of soul of the one who relies on Hashem") and "peace of mind": Go to the store right now and buy out all the ice cream! (Or whatever works for you, with your rebbi's supervision of course).
Bottom line: Live of life of doing what works for you and brings you a happier and healthier connection with Hashem. The more "Hashem" in your life, the more the "miracles"!