Holding bitcoin is not the same thing as trading bitcoin. Gambling and trading are not the same thing too. Trading require you to learn trading skills but gambling require just some strategies. Trading can be risky like gambling, but they are not the same thing. If the price of bitcoin fall already, you can invest for months or years and you will most likely gain.
People tend to mix the two most of the time since they both involve risk factor, but it's much less of a risk when we're talking about hodling and trading since you can still get back your "thrown" money while in gambling, if you lose, it's entirely zero.
Even if trading can still be learned sometimes, there were times from my experience that I needed to be lucky just to squeeze tiny profits. I had day traded before so yeah that was my experience at the least.
I like the way you differentiate the two, bitcoin trading is more of calculated indices, it's futuristic and realistic. While gambling main principles is primarily on luck and predictions. I think that if a bitcoin trader chooses to apply this principles of gambling that is based on luck and predictions, then it somewhat becomes a gambling method, which might not yield favourable results in terms of earnings. Better to stick to a realistic method of calculated indices, as you have rightly mentioned.
In a volatile market, luck
can still become a factor. It's not always 100% skills and hardwork, luck comes into play also............ well just like in life.