Trust requires an uncertain situation. If you have already received what you sought, what need is there to trust?
Trust is for times of uncertainty. When you fall into such times, I hope you know one who is trustworthy.
I wonder if God tests us in this way. He wants to us to learn what it means to trust him, and so he takes away everything we have learned to lean on. How do we trust God when we find ourselves to be in free fall? I don't know. You just have to do it and hope.
The one who endures to the end will be saved.