I bought a Minecraft alt, but it has someone's private photos and work emails on it. Need help

Hi everyone, I need some serious advice regarding a security concern.

About a week ago, I purchased a Minecraft alt account from a third-party seller. When I logged into the Microsoft account, I was shocked to find that it contains a large amount of personal data from about a month ago. This includes:

* Private family photos

* Work-related correspondence/emails

* Billing information and invoices

The game itself works, but I feel extremely uncomfortable. It’s clear to me now that this account was likely stolen from an actual person before being resold to me.

I have a few questions:

1. Am I putting my own PC or personal information at risk just by staying logged into this account?

2. Should I attempt to contact the original owner through the info I found, or is that dangerous?

3. What is the safest way to handle this? Should I just log out and never use it again?

I deeply regret buying from a third-party site and I've definitely learned my lesson. I just want to make sure I’m not compromised. Any advice would be appreciated. Thanks.