I am really surprised seeing the current situation of the market. Approximately, all he popular coin price is drastically falling. What is it symbolizing?? Should I do invest now or wait to see what happen?

One thing is sure - the bearish market is far from being an indication of discontentment or people giving up on cryptocurrency, but the allure to relive the exponential growth of the most established coins, this time in tokens, is where all the money has being drained to.
Bitcoin is tried and tested but you see ICOs springing up like mushrooms, that's the craze and unfortunately a good number of them are white elephant projects, sooner than later the bubble would burst and they would come running for safety. What all that means is that the real party is in mopping up as much Bitcoin and a few well established altcoins and then sit back and watch history repeat itself.