God may seem silent to us, but by trusting His perfect timing, believers recognize the Father actively hears and answers every petition with a yes, no, or wait. Divine silence purposefully builds a deeper reliance on Jesus. Although unconfessed sin or selfish motives can hinder fellowship according to James 4, maintaining unceasing prayer aligns your heart with His sovereign will.

Source: https://www.gotquestions.org/unanswered-prayer.html