Brother Muslim, now after you have learned how to invoke Allah (subhanahu wa ta'ala) the way the Prophet (peace and blessings of Allah be upon him) did and ordered us to do so, you must always remember when you invoke Allah (subhanahu wa ta'ala) that you are dealing with the Master of everything. The One who Created you so you should have the feeling of this great worship of Allah (subhanahu wa ta'ala). In other words, just imagine, as you are asking promotion from your employer. Before anything else you have to do your job in the best way he likes you to do. So you will even work harder and give extra time just to please him. Then, you will choose the best time where he will be in a good mood, and you will ask him with the best words he likes to hear from you or to please him (your employer). So if you do it by that way you will more likely get what you want from him. Think brothers, the same with Allah (subhanahu wa ta'ala). Invoke Allah (subhanahu wa ta'ala) just the way He likes, so you will get from Allah (subhanahu wa ta'ala) what you want and if you do not get what you asked for, you must know that the problem is with you and you must check your self and your Faith. At the end, I ask Allah (subhanahu wa ta'ala) by His great names and His great attributes to lead me and you to the best of deeds with sincerity for His sake only and peace and blessings be upon the prophet, his family, companions and all of his followers till the last day.