Sometimes I think that when it comes to prayer, the problem isn't lack of faith, but rather the enormity of God.
You know how you feel when you walk into a gust of wind and it is so strong that it literally takes your breath away? Sometimes that's how I feel about God.
It seems to me that He is so big, so mighty and so capable and willing that it takes my breath away and I have to go back to the basics of who He is. I have to ponder Him and the works He has done during the brief history of this world and then I remember how tender He is, how willing to save, how much He comforts and forgives, how long suffering and patient, how mighty He is and who I am in relation to Him.
Then I can pray with a faith the size of a mustard seed with confidence that He hears me, not because of who I am, but because of who He is.
Once again, it comes back to the Bible. If you read it, all of it, and often, you can't help but be impressed by Him and really understand why He says we are made of 'the dust of the earth', and calls us 'worms' because compared to Him, that's exactly what we are.
With so mighty a God as He, and He is our Father (!), what can we possibly ask of Him that He can't give to us???
So when I see a little of how magnificent God is, all my prayers seem to be such a small list and I have courage to keep adding to it, and adding to it, and adding to it :0)
Take courage and enlarge your prayer list. It's not that God can't do it, it's that we can't.
You can't wear God out.
'Now to Him who is able to do exceedingly abundantly above all that we ask or think, according to the power that works in us...'