Fr. Ripperger tells us in one of his talks on our guardian angels, as a friend reminded me yesterday, that we can and should ask our angels for help in growing more perfect.
Specifically, one can ask one's angel to humble one and make one see one's predominant fault.
I am praying this prayer-Dear Angel, humble me interiorly and show me my predominant fault. Then, show me how to destroy this fault, for the glory of God and His Church.
I made up this prayer, but it works for me. Your angel wants you to become perfect. I am asking mine more directly to help me on the way to illumination and union with God.