It says in the Holy Quran:
And to Allah alone belong all perfect attributes. So call on Him by these. (7:181)
This verse tells us the secret to getting our prayers readily accepted by God. While praying, we should invoke the Attributes of God that are directly related to the object of our prayer.
This will make our prayer more susceptible to acceptance, because, by so doing, we would excite the jealousy of God with respect to the relevant attribute of His, with the result that the prayer (if otherwise acceptable) will not be suffered to go in vain.