What is the next mission in assassins creed 2 after unlocking altars armor?

After unlocking Altair's armor in Assassin's Creed II, the next mission involves returning to the Villa Auditore in Monteriggioni. You will then need to progress through the story, which includes missions that lead to the eventual confrontation with the Borgia. The gameplay continues to unfold with a mix of exploration, assassination contracts, and the overarching quest for revenge against the Templars.