The account cheated or some sort of sharing has occurred. (account, library or phone number)

VAC bans are permanent.

Click the info link next to the ban notice on your profile and read.

引用自 Broken Soul：

Can someone tell me about it

You have had over a thousand days to be "told about it", but you just now took notice ?

https://psteamcommunity.yuanyoumao.com/profiles/76561199156833964/posthistory/

Looks like you never used the account until recently then.

As the helpful user Beardface31 said, use the "info" button and you can learn all about it.