All of my Dota 2 accessories were sold at a low price

[从来不觉得玩dota2开心过]

I have a mobile phone guard token that doesn't work at all

[nullable]

Secure your account, and be more careful in the future.

[Cathulhu]

Hijacked, not hacked. You leaked your account credentials somehow.
The Steam Guard Mobile Authenticator can not protect you from your own foolish actions.

Do not trade until your account is secured.

Take the following steps to secure your account:

1. Scan for malware. https://www.malwarebytes.com/
2. Check that the email and phone number on the Steam account are still yours.
3. Deauthorize all other devices. https://store.steampowered.com/twofactor/manage
4. Change passwords from a clean computer.
5. Generate new backup codes for your Mobile App. https://store.steampowered.com/twofactor/manage
6. Revoke the API key (there should be no key). https://steamcommunity.com/dev/apikey

Steam does not return inventory items or wallet funds: https://help.steampowered.com/faqs/view/3B6E-B322-2400-8D24

If you no longer have access to your account, read this:
https://steamcommunity.com/sharedfiles/filedetails/?id=1126288560

[Bibo1]

Stop using scam sites or groups that promise ♥♥♥♥♥♥♥♥♥♥ or cashing things out of Steam.
You're in at least 2 and probably gave away your login info there.
To make it clear, you gave them the keys to your house.