Prayer is powerful. It can change lives and those lives can change the world. Many people are not familiar with truly powerful prayers. They are raised in religious traditions that emphasize going through the motions above anything else. They believe that if they say certain words at certain times of day, they will receive God's blessing. In reality, there is no simple formula for a powerful prayer. It requires skillful wording, pure intentions, and realistic expectations. You cannot expect God to act differently for you than he does for everyone else. You have to be willing to wait for everything to occur in its own proper time. If you can do that, you will be truly blessed in all of your undertakings.
Nonetheless, there are some formulas for making your prayers powerful. One of the most important things is to make them personal. Reciting a standard credo from your faith is a good way to set up your prayers because it gets you in the proper mood. Nonetheless, powerful prayers come straight from the heart. It is alright to pray for universal peace, but also don't be afraid to ask the lord For the thing that is foremost in your mind. If you want financial security, good health, or some kind of blessing in a coming venture, ask for it. There is nothing wrong with asking, and God may See fit to answer your request.
Sometimes, the most powerful prayer don't even need words. I have had experiences where it hasn't been a verbalized request that has been answered, but rather a strange and vague longing. Sometimes I get extremely overwhelmed with emotions, and cry out while I am praying. These are the times that I feel most in connection with God. I can almost see the face of the divine and feel it close to me. That is how you know that your prayers are likely to be answered.
Of course ultimately, it doesn't really help you to think about finding powerful prayers. The important thing to do is to trust God. If you try to make your prayers powerful, you are trying to manipulate divine forces. Although this isn't wrong per se, it won't necessarily work for you. Pray to God with a sincere heart and you will be blessed. Try to really talk God into doing something for you, and you will probably have less luck. Faith is crucial in a moment of prayer. Without it, you will get nowhere.