EndreWhiteMane: I'm logged off everywhere, is there more than that that needs to be done?
Interesting that you are last shown there 1 week ago, that's weird.
There's an option to lock your account. No purchases are possible, pretty much everything but actually playing the games is shut down. I did that to be on the safe side.
Course, at this point, pretty much everything Steam-related is shut down aside from being able to play games in the library. Not sure if it would allow you to get to the password change screen that causes them to generate the auto email with the link you need to lock down the account.
(Their process for something so important is just a bit idiotically designed, I think.)