why now all coins are going down and when are they are are going to stable ..any idea pls help me because i have invested around 100000USD into crypto in last year
Having that amount of money, you should have done your best to research and carefully weigh the consequences of your actions. Anyways, you will not suffer losses if you don't sell lower than the price you have bought your coin so hold it for a little longer until the market recovers and take this time to study more about cryptocurrencies.
Exactly, ignore the noise in the short term, you will be happy you did. At the moment, these are only paper losses. Nothing is real until you make it so. This goes the same for on the way up.