Again you're ignoring the context of Babylonian captivity. At the very beginning of this chapter, it is prophesied that Israel will rule over their oppressors who had taken Israel captive, the passage of 14:12-15 does fit the king of Babylon as a comparison between the king of Babylon and Satan.
Then people will take them and bring them to their place, and the house of Israel will possess them for servants and maids in the land of the Lord; they will take them captive whose captives they were, and rule over their oppressors. (Is. 14:2)
As a matter of fact, Babylon was already doomed during Daniel's lifetime, the clash between the northern and southern king is another prophecy for another time.
God has numbered your kingdom, and finished it; TEKEL: You have been weighed in the balances, and found wanting; PERES: Your kingdom has been divided, and given to the Medes and Persians. (Dan. 5:26-27)
That very night Belshazzar, king of the Chaldeans, was slain. And Darius the Mede received the kingdom, being about sixty-two years old. (Dan. 5:30-31)