i think there should be a symbol that the bear market come, i don't know the reason why do almost all the coin price include btc and eth do down
No one knows with certainty and its largely due to the forces of demand and supply and how the market participants reacts to the market activities which in this case I see it as normal in the crypto-business. Even in the fiat exchange market where stocks are traded, the reasons why prices drops on increase is because of the regulations but in crypto forces behind decision making of participants are not obvious to everyone.
I am holding 6 coin at once. Waves,wings,Ethbits,Pesobit,Nxt,Lun and all of coins arre dumping!! Why its happening? now if I sell, I will lose $1000 usd at once. when the price will pumping again??
If you can stand to hold, I would suggest you do but if not, just count your losses and move on.