You can become God and can become even the master of God provided you follow one condition.
That condition is that you should never think that you are God. Take the case of Hanuman.
He became God and attained even the power of creation of world.
Brahma sutras say that the soul may attain all the powers except this one power.
But Hanuman, as an exceptional case attained even that power and became exactly Lord.
But He always thinks that He is the servant of the Lord. Radha became the queen of Goloka, which is above the Brahma Loka.
The Lord sits in Brahma Loka and her feet are above the head of the Lord.
The Lord in the form of Krishna also pressed her feet.
The Lord applied the dust of the feet of Gopikas on His forehead.
Therefore, Radha became the master of the Lord. But still Radha feels that she is only the most beloved servant of the Lord.
This is the correct route of becoming the God or even greater than God. But if you think that you are the Lord already, such route is not correct and then you will not attain even a trace of the grace of the Lord. Only demons thought that they are the Lord and some demons thought that even they are greater than the Lord. You cannot achieve the fruit by this path of egoism and sanctioning yourself as the Lord already. Hanuman killed the devils and demons. What does it mean? It means that the concept of Hanuman will remove the concept of egoism of devils and demons by which one thinks that he is already God.