I will consider the three points listed above as necessary for anyone that want to be successful in day trading of cryptocurrency. Meanwhile, I feel that discipline and greed are almost the same thing, so they shouldn't be treated separately. If someone is disciplined enough in trading, they shouldn't be greedy.They should be able to know when to enter the market and when to exit.
Risk management is very important and not only in trading but in every espect of life.

But there is one thing you did not list above and that is knowing how to trade. You must know how to read the charts and listen to the fundamentals. You can understand that many newbies of these days does not know how to trade but they have been trading maybe after watching one or two YouTube videos.