The best way to keep it from crashing is to used it but it cant be done by alone unless you are a whale so you need to asked a lot of people to used bitcoin the more person you asked to used bitcoin, the less percentage it will crashed
The problem bitcoin has at the moment is its deflationary. Therefore it does not work well as a currency, but certainly works well as a store of wealth.
I think long term it will be seen as a digitial store of wealth, thats what will prevent it from crashing.