but trade it with profit is better than holding bitcoin.
Why limiting yourself to doing one thing, when you can do both long term holding and short term trading at the same time? I do exactly that. I have a certain amount of coins in my cold wallets that I will not touch in the coming 5-10 years (I have been holding them since early 2013). This is my long term investment.
Alongside that, I have a certain number of coins combined with a certain amount of fiat that I use to do my trading. That's how I get my profits. It doesn't really matter for me if the price goes down significantly, or goes up significantly. I make profit whilst trading either way. It takes plenty of my time, but it's definitely worth it.
Yeah there is no guarantee that long term holding will give only profits to you, if price drops dramatically then holding will be useless so its always good to take benefits from short term fluctuations to make quick profits and that can be done if we are investing our money in trading bitcoins or altcoins.