No investment guarantees instant profit, there are many processes and things that must be learned again in order to achieve the desired investment success target.
Whatever the investment instrument, there is always a small or big risk. So before starting make sure you understand the characteristics, risks and profit.
This is definitely true, there's no investment that guarantees instant profit especially if this characteristics is what you're looking up to cryptocurrency, the volatility of the market would still be the top concern. In my case, I would prefer to take profit out of my investment when the price of my principal amount were double already or depend on my desired amount. Also, some factors are depend on other necessities or emergency needs. But as long as I can be able to hold it for a long term I would choose to hodl it for a quite long while.
When you have your capital back, whatever is left could stay there forever and can become 1 dollar if it has to, the waiting period is a lot better that way. I mean you investing 1000 dollars into something, it triples in amount, so you take that 1000 dollar out, the other 2000 dollars worth can be there for 10 years and you do not have to take a second look at it, it could become 50k, it could become 50 dollars and it would be all the same since you can't possibly make a loss.
I have friends who follow this rule and they have made a great return in over a course of period. This is not the most profitable method since it takes out some of the risk, but it is definitely a great method to drop the risk when you are ahead. I was thinking about doing the same thing, but I am in good profit now and I do not plan on taking anything out yet, I just want to wait and see what happens next.