To make the devil flee, we need to submit to God first! We have to understand that we cannot do it alone. We need the power of Jesus to rebuke the devil and to kick him in the rear-end. We often hear people say “Resist the devil and he will flee” but the most important instructions come earlier in the scripture. James advises us to submit to God before doing anything else.

Submit yourselves, then, to God. Resist the devil, and he will flee from you. – James 4:7

To submit means to arrange oneself under the command of divine viewpoint rather than to live according to one’s old way of life based on a human viewpoint. It is a process surrendering our own will to that of our Father’s. More information here: https://www.gotquestions.org/submit-to-God.html