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Deauthorize all devices https://store.steampowered.com/twofactor/manage
Change your password on a secure device.
Generate new back up codes. https://store.steampowered.com/twofactor/manage
Revoke the api key https://steamcommunity.com/dev/apikey
Check that the email and phone number on the steam account is still yours.
A malware check would not hurt either.
The most likely reason for this to happen is, that you logged into a phishing website. "Get 5 Dollar", "Vote for my Team", "I am giving away all my inventory"... that sort of crap. Don't do that.
And speaking of it:
Do never enter your Steam login details directly on other websites again. Instead, when a website (even if it seems to be a Steam profile or trade) asks for your Steam login, leave it, go to the main page of Steam (store.steampowered, maybe best to bookmark it too, so you don't fall for false main pages) and log in there. Then go back to the other website. A legitimate website now will show your account on the login page and will allow you to confirm it. A phishing page, that wants to do bad things to your account, will keep asking for your name and password.
Do note that nobody "hacked" your account, you leaked your account information somewhere.
Also, used antivirus and removed a malware before changing password from my laptop. Is there something else I should do aside from the list?