I see evidences of God’s existence in nature, in life. I hope I am not coming off as disrespectful if I say: what if the answer to your prayer is there all along, only if you look at your surroundings more closely. We (me included) sometimes brush off the little miracles as mere coincidences. Or perhaps we are so used to something that we don’t consider it a miracle anymore.
If my child keeps asking me: “Please prove that you love me.” A hug or a kiss would be a gesture that may or may not prove my love. A person can be indifference towards someone and still hug and kiss the other person. However, such gestures may appease my child if she is not of age of critical thinking. To my child, I would say that: “I provide a house for you, clothes, food, your being able to go to school, etc. Sometimes I do get angry and punish you, but it, hopefully, will teach you right from wrong. These are my ways to prove that I love you.”
A couple of things to keep in mind when praying: He answers in His time, not our time. His will, not our will. His ways, possibly not the ways that we expect. He may also use other people/things to answer.
Anyway, back to the topic, I usually pray in silence. Sometimes sitting, standing, kneeling. Sometimes I close my eyes, sometimes I don’t. Sometimes I look down, sometimes I look up. I agree that it is not the HOW that matters. Be loving, be honest and be persistent.