Opportunity Prayer is not the attempt to get what you want.
Opportunity Prayer is giving God the opportunity to do what God wants.
The prayer of Jesus on the night before he was crucified is the shining example. After asking his Father in Heaven to release him from the torture soon to come, Jesus said, "nevertheless, not my will but Thine be done."
The thing to be sought in prayer is the will of God. Opportunity Prayer is you opening up of your life to the opportunities God has to set before you.