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The remaining money left can instead be in bitcoin and not necessarily as an investment, because we may need to use it anytime and that will not be a disappointment on us selling at unprepared time, i know bitcoin to be of a profitable asset and there is much possibility of making more profits if we have our assets, investments or any money for upkeep in bitcoin, because we are having control in it and are in full custody of what belongs to us, not only this, we still stand a chances of earning more as the market provides volatility and by this we can earn when it rises.
What you said is usually done by some people who do not have enough funds or in other words who only have simple funds and nothing more so that rather than just saving in the form of money, of course it is okay to use the funds to buy Bitcoin. But it would be better if the funds that have been used to buy Bitcoin are not cashed back into another currency so that the Bitcoin that has been purchased can really stay and be well maintained before the owner buys it again when he has more money that can be used for that.
Because if the Bitcoin that has been purchased is only stored temporarily because of the reason of needing money as soon as possible, of course it will not be effective enough to do because Bitcoin is not always at the highest price so that the person could lose if they sell it in a correction condition. So it is better to set a fairly mature plan if you really want to buy Bitcoin in the long term because if you only buy it temporarily, I think it will not be suitable enough to do because besides there is no guarantee of profit in the near future, it can also seem like a waste of time.