Invest time in a deep relationship with Him by reading and doing His Word.
Time invested = hearing His voice
The level of your faith is directly proportional to the depth of your relationship with Jesus;
He is the very author and finisher of your faith which comes by hearing Him, because He is the Word of God:
Faith comes by hearing (the message of God) and hearing (the message of God) by the Word of God;
John 14:6 Jesus saith unto him, I am the way, the truth, and the life: no man cometh unto the Father, but by me.
Hebrews 12:2 Looking unto Jesus the author and finisher of our faith; who for the joy that was set before him endured the cross, despising the shame, and is set down at the right hand of the throne of God.
Romans 10:17 So then faith cometh by hearing, and hearing by the word of God.
John 1:1 In the beginning was the Word, and the Word was with God, and the Word was God.