What happened? How did you lose all your cryptos on yobit?
It would be nice if you could provide screenshots and stuff like that. Were the funds just stuck in withdrawal, or your account frozen etc.?
Can't say that I'm surprised though. Yobit is one of the most notorious exchanges that are still operating to this day. They can pretty much be classified as a scam and nothing more by this stage, because of their completely broken site and unresponsive support.
If you want testimony, then just search "Yobit scam" on the forum, you'll find hundreds of scam accusations about them. But please, describe your own situation so that others know what's going on as well.