Having a strong prayer life, along with fasting is what will sustain you through the wilderness process & trying times, of preparing you for your calling. Especially when you’re dealing with a spiritual battle with the enemy that involves hindering you from been able to fulfill the calling of God on your life. You would need to fight from a place of power, the power that comes from knowing who you are in Christ, and knowing what God has placed inside of you. The reason the enemy is fighting you so strongly, is because he can see the destiny God has for you, and he is trying to kill that dream, and to prevent the plans of God from coming to pass.