Fomo doesn't always work, sometimes if favours but most times it's so misleading, I don't get controlled by the present Bitcoin movement, jumping in and buying coins now is so risky, I think the buying days are over
There is no time limit for buying btc if you believe that it will really skyrocket to the moon in the future. Yeah! The prices are now slowly going up bit it doesn't necessarily mean that "buying days" are all over. Of course you can still hoard as many as you can, today is a good day for doing such thing rather than doing it on its $20k mark, isn't it 
? I think when you are investing, either it is bitcoin or other altcoins, the basis you should check is the opportunity to have profit.
If you want to buy with the hope of it will moon in the future, then you are wrong.
Do your own research, develop an investment pattern and secure your assets.