Nobody knows when the best time to invest comes. In any case, no one will say. Focus on your personal financial condition and proceed from the possibility of losing all your investments. If this option does not scare you, then for you the best time for investment. 
Indeed, bitcoin is one of the best investments in the world right now and it is flourishing very nicely but obviously if you really want to get involved into bitcoin, you need to research a lot about bitcoin.