because Odysseus is avenged already.
Athena helps Odysseus as well as Telemachus
Telemachus initially thinks Odysseus is a stranger when they reunite, as Athena has disguised Odysseus to test his son's loyalty and bravery. Telemachus only realizes the truth after Odysseus reveals their shared knowledge of a secret about their household.
She does
To find his dad, Odysseus.
At first Telemachus thought Odysseus was an old beggar, but when Athena made Odysseus appear majestic, and instantly changed his clothing, Telemachus thought he was talking to a god.
Athena advises Telemachus to leave Ithaca and travel on a journey to find his father, Odysseus
Telemachus and Athena
Telemachus originally thought Odysseus was a god because Odysseus had magically had his appearance changed right before Telemachus. However, Athena was responsible for the sudden change in appearance.
Athena transforms Odysseus and makes him appear majestic so much so that Telemachus mistakes Odysseus for a god. Odysseus tells Telemachus that he is indeed his father, and it takes a little time for him to convince him of this.
Odysseus persuades Telemachus by revealing his true identity, proving he is still alive and capable of taking down the suitors. He reassures Telemachus that they have the gods on their side and that together, father and son, they can overcome the suitors' tyranny and restore justice to their home.
Athena encourages Telemachus to go on a journey to see if his father Odysseus is still alive and when he finishes this journey to go and kill the suitors.
Athena tells Odysseus to reveal his identity to Telemachus, as there is no point in keeping it hidden from him. Telemachus can also help his father on his quest for vengeance, as he is completely trustworthy.