To realise quick profit in Bitcoin, one can be so lucky to buy today and the next day the price rise giving unimaginable profits. The reverse can also be the case and the result could be a huge loss. In reality, this is pure gambling which can be avoided by simply adopting the long term perspective.
If the price of bitcoin can rise the next day, they can obviously get very lucky and sell it. But that's very difficult right now, especially as prices move wildly and are difficult to predict. Small investors can still buy bitcoin today, hold it for a few days, and sell it if the price is a few days later. Otherwise, they could keep holding it for the next few days.
If you analyze before buying bitcoin, it is not gambling. But if you buy without analysis, it is gambling. However, if you are able to hold it until the price rises, you will still make a profit. But you have to be patient.