Doing another one of these question experiment posts! :)

Let's say, theoretically, the world doesn't get destroyed when you meet Chara. Infact, Chara doesn't meet up with you at all. You're free to roam around the underground as you please. Well... What next? How will you leave the underground now? Can you even leave?

What would make the most logical sense, to you, as to how to get out of the underground? Do you utilize the SOULs somehow? Are you just forever stuck to rot in your own hell? Have any other ideas? Lemme know! ^^