I would like to try to persuade you that the chief end of God is to glorify God and enjoy himself forever (also the historic first point of the Westminster Confession). Or to put it another way: the chief end of God is to enjoy glorifying himself.
The reason this may sound strange is that we tend to be more familiar with our duties than with God’s designs. We know why we exist – to glorify God and enjoy him forever. But why does God exist? What should he love with all his heart and soul and mind and strength? Whom should he worship? Or will we deny him that highest of pleasures? It matters a lot what God’s ultimate allegiance is to!His allegiance is utterly and only to Himself. Sound egotistical. Yes. But He has the right to be. We worship Him as He wants to be worshipped.