God is never tired of hearing our prayers. As a matter of fact, as Christians we are encouraged to pray as often as possible. But it should not stop there. Prayers should not limit us from taking actions. We must not leave everything to God. There are things we can also do on our own path.
One thing that happens when we genuinely cry out to God is that He gives us instructions on what to do. Failure to carry out these instructions may lead to our prayers going unanswered. But when we carry out these instructions we see the hand of God in that situation.
Many a times the reason why our prayers does not get the desired expectations is because we do not play our own path. When we fail to do so we should not blame God. God is not a magician. God actually answers prayers but it is left to us to do the needful so that it manifests in our lives.