-200% ?
Well that's a first.
He have his own mathematical way.

What happened to OP is nothing but as usual thing and this happen oftentimes. Like I bought ADA but after a week it dump hard, so instead of buying more and do day trading I just hold it and sadly I lost almost 80% of it. The problem is sometimes we thought it's already the bottom but it is not.
I must admit that somehow I lost trust in altcoins and I'm trying more to stabilize in bitcoin.