I already answered you in your other thread.

Steam Trade Ban

引用自 jankso ♥♥♥♥♥♥♥♥♥♥：

Steam Trade Ban

Hello, I want to withdraw skins from a certain popular website, but I can't withdraw them. The website's technical support wrote that I have a ban. On Steam, the only thing it says is that my account is blocked from trading, but the number of days it is blocked is not specified. Is there any way to check this?

You changed your profile name 2x recently...

https://steamcommunity.yuanyoumao.com/profiles/76561198294412230/namehistory

You won't find any official documentation about it.

The unfortunate part about the new profile name change trading cooldown (4 hour cooldown every time you change your profile name) is that page (linked below) will only state, "we have confirmed your account is unable to trade" generic message. Leaving people wondering wtf is going on.

https://steamhelp.yuanyoumao.com/en/wizard/HelpWhyCantITrade

The error while you trade during this cooldown is error (34).

It took a while earlier last year to figure out Valve silently added the new cooldown.

https://steamcommunity.yuanyoumao.com/discussions/forum/1/4202490424033360096/