It was never been a passive income since you do need to put up effort and action for you to be able to earn or making profits. Dont know on why other people been that saying about passive income if you do need put up effort? Just like on what you have said that the only time that what makes it passive is on the time that you are doing staking but we do know that this isnt considered as trading right? Getting back into the question on if its possible to become a master in trading? Of course you can but it wont be that a short time for you to be able to acquire such skills on which we do all know that it will be needing up that sufficient time and effort for you to be able to have that good grasps into it. You cant just that easily learn it out without facing up trading difficulties specially on dealing up with something unpredictable. Mastery does involved that tons of hours that you can put up into something and keeps on repeating on which it wont be that much of an easy thing since dealing with market is never been that simple. You would be needing up to survive tons of challenges that you will be able to face up along the way on which this doesnt involved only psychological aspects but also with emotional aspects too on which these are the factors that will be affecting you out along the way.