why are all these cryptocurrencies are going down?
keep patience and you will see the price of them again increasing. If you are talking about only bitcoin then it is only a smaller correction and because of some rumors people are selling and when they will find that the price will increase then they will again start to buy and for other altcoins I think people are putting their money in bitcoin right now and when they earn their profit then they will come back to altcoins so the price of them will again start to rise.
Patience is a lot of attribute needed to be able to successfully make good decisions in the crypto world either as holders or as traders.
It is not going to always be easy, but as long as you know what you are doing and you understand what you are investing in, then the last thing you will ever do is to be worried. In no time, a good market always gets back in shape and then you see it get pumped again.