For the volatility of bitcoin to be checked, most people joining bitcoin markets and trading have to understand the true value of bitcoin. People join through FOMO and sell at lower prices than they bought because of FUDs. Also, holders who owe significant amount of bitcoin have a role to play. But most of the big holders would always want more. When you let your coins slide, they'll gladly hold it. It's almost impossible to curb volatility since the power is in the hands of every individual holder of bitcoin. Perhaps it may be possible to control volatility when we all start thinking the same suddenly.