The following page of Assassin's Creed Odyssey guide describes the most important decisions you have to make during the sixth chapter of the game.
This chapter of the game's adventures is relatively short and does not offer any important choices in the game's main storyline. However, during this chapter, you can perform several side quests on the island of Naxos and the surrounding islands.
The only minor choice is actually the tone of the main character's conversations with his/her just found mother. You can choose what attitude you want to adopt and how to respond, for example, to the requests of hero's mother to save Alexios/Kassandra. However, this choice is of little importance - don't get upset about the answers. Definitely more choices await you in the upcoming 7th chapter of the game, where you will visit numerous corners of Ancient Greece.