Yes,I believe greatly in luck,but remember that luck is a gift.
In trading bitcoin, I will say knowledge should lead you,have they knowledge of they kind of trading you venturing on bitcoin before trading or holding.I do believe in luck.
Luck may be a gift, but in trading bitcoin, I do not see in anyway how luck is going to apply because your luck may not actually take you too far before you start flopping real bad.
I like the fact where you have said knowledge should lead you and that is unfortunately the aspect a lot of traders always leave out first and then they think they can just hit the charts and with luck on their side, they should be able to make profitable decisions but things do not work that way.
To be successful in trading, we need lots of practices. But, you can only practice what you have learned actually as you cannot know what you are even doing, let alone practicing without having the basic knowledge of what to look for before entering a trade and when you should know when to be exiting a trade. As you have this knowledge and you are practicing what you have in your skull, you will keep getting confidence in your trading decision over time and that is the main essence, rather than not having the knowledge.