If you know what to do in trading you will have a passive income you will need patience
Trading requires effort, and thus profits you generate through trading can't be considered passive income. Passive income is income that you don't have to do anything for. Example; Earning interest is passive income. Cloud mining is passive income. Gaining income through the ads you have on your site is passive income. And there are of course more examples, but you have an idea now.
It doesn't come up with a high risk if you are well trained trader. Trading just need some knowledge and if you have that then you don't need to be worry about losing money because you can minimize that with your knowledge. Fluctuations is one of the best thing you need in order to get a lot of profit which bitcoins had.
I always say, if you're a well experienced trader, you'll be using like 75% skills, and the other 25% is luck. The 25% luck is something we can't rule out since markets can move into the exact opposite direction at any time. Reason may be that a large trader with the ability to move markets has changed his approach due to inside information. Or perhaps that one is looking to spontaneously buy or sell a huge number of coins at once.