You are very right and in the real sense of it, you are still not late at all, because if you opp in now and still hold for some time, even if you can not double your investment as predicted, you shall be more than been brake even for sure. All things been equal, come in with moderation, by not investing wholesomely all what you have but by diversing into few other better and researched ones in any case of eventuality. Also ensure to consider risk, where you should not invest more than you can afford to loose.