I would Say the first thing to do before investing into bitcoin or any cryptocurrency or even any investment outside this is to accept that it can go down and refuse to climb up again and that’s why we call it a risky investment: I know most people will say bitcoin isn’t like that and it is true but having that mentality will make you invest an amount that you can afford to lose
Yes, what you say is not Wrong , although when I trade I always do this, I only put in the money that I am willing to lose, but when there are doubts you can't start inventing , in the same way the Degree of investment that is going to be made in bitcoin is Safe , but if there is an investment you must buy that it is for the long term , it is the only way that you can make a profit in bitcoin , of course you may be Lucky and the price increases from one day to the next , but that is luck , We don't know when bitcoin will increase , but it is a fact that you can make any type of Investment in btc and that it is Safe.