There is no luck to be had all stocks have a minimum and max value and their growth isn't tied to in-game events it's completely random so once a stock crashes instead of dying it just get back to high numbers so wait till you find stocks at zero or close to it invest all your money and wait (remember stocks doesn't die so if you loss just wait till the gain s green and if you se a pattern like 032435 keep waiting until it goes two times down 032435654 is where you should sell (those are stocks prices not money value)