This period do not encourage trading or investment but at the same time when price is down is good opportunity to buy cheap and when its explode you will gain it. Nothing is lost in bitcoin, those holding for long now are the great benefactors but if you buy this period is more safer.
If I have money now, I would buy half of bitcoin because in next three months it will double the current price. This is real because it always occur this way after 5 years remember in 2011 and 2017 from the market charts and caps. And this year will break more even.
First of all, what you said is correct that you should be one of the Bitcoin believers, you should buy if its value goes down in the market as long as you have a chance to buy, it is really a good chance, and do it until the bull run comes or the right time and season.
Second, we are not obligated to buy a Bitcoin or half of it, the beauty of Bitcoin is that as long as our budget allows us to have bitcoin, that's why we always advise most people to apply the DCA called here, and I don't believe that if you invest Bitcoin now, after 3 months it will double its value immediately, this is not true and where did you get what you said? Is there a configuration for this?