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The korban todah was sacrificed on the Altar as a token of appreciation # 26347-EYAL-6
for the miracles that Hashem did with His people. For example, this
korban was brought by a sailor who arrived safely at shore, a traveler who
crossed a desert, etc. In our days, since the service of korbanot was
abolished, we recite bircat hagomel instead.
The main point in recounting the Exodus on Seder Night is in order to
praise and thank Hashem for the wondrous miracles He performed for
us.
King Chizkiyahu was not appointed as Mashiach because he did not
adequately thank Hashem for the great miracle that He performed for
him. Certainly, Chizkiyahu did say shirah to thank Hashem. However,