At the same time, while we do pray for our material needs, that doesn’t mean that G-d will deliver. Sometimes G-d says, “No.”
Not only that, but there is a concept called, histadlus. It’s the actual effort in changing the situation. Prayer is meant to change us. It’s a humbling experience. You come out of prayer a different person than the one who came into it. However, sometimes prayer alone is not enough to change a situation.