Market price in some cases are unpredictable because I have heard of some one buying a coin in a certain rate, but just for sometime it get reduce to a lower rate,so market price is unpredictable
That is the reason why you don't have to buy with a short term mindset ( trading) because the market is very volatile and so buying with the intention to sell very early when the price appreciate is a total waste of time and it is more like a deceit because the chance of it happening as predicted is not known or certain. So to avoid all these, it is advisable to invest in Bitcoin and hold it for a very long term at least 4-10 years and if been carried out properly, following all the procedure there is a possibility you will see something great because Bitcoin potential is always seen in long term of holding.
Well trading, investing and then holding for long term all are different things and I think one should have certain portfolio fix for each type of these strategies and plans.
I'm saying this because a trading especially the spot and the future trading one will get short-term profits and that will make him satisfied and happy and he will not touch his long-term portfolio. In this way he can enjoy both the perks of short-term and the long-term gains.
trading should not be considered fist but investing into Bitcoin should be first priority. Yeah a person may decide to have a separate wallet to buy and stack Bitcoin and still be trading as you said but that should be when an investor have accumulated enough Bitcoin and decide to gamble with %1-5 of the profit made from his Bitcoin investment, and not doing both at thesame time when such person has not met his target. Atleast after investing for a long time and you have accumulated enough and you decide to gamble, the risk will be less but doing both at thesame time may result to lack of Concentration because greed will cloud your sense of reason, making you fill that trading will give you more profit quickly than HODLing for long and gradually you become addicted to trading and or gambling and may never think of investing and HODLing, that's why we often advice to focus more on accumulating Bitcoin and HODLing than mixing up things and later regretting.