I just hold several altcoins in 2 years.
2 years ago my assets were estimated 1000$++ and now just 50$

Yeah, your investment story discloses the fact that there are losers among investors. Not all investors will get profits from their investments. Now, let's tell us the truth, because I believe (from what you disclosed) you invested in so many shit altcoins with hope that they will rocket to the Moon. Unfortunately, the opposite scenario happened, and you got losses.