You can make a lot of profit with holding the bitcoin for a pretty long time and I think that if you would do it now you can make big bucks because its going up more and more from now on.
The best time was when it was 100-200$ around but yeah who knows in coming years what price bitcoins reaches so its better to save some bitcoins, which I personally have also done, than to regret later thinking why I did not stock. Basically bitcoin was designed to have huge prices in future with the feature of halving. So, we must make use of it by saving it.
There's no need to still think of the past because we are in the present, still we can make profits with the current price if we will trust the future of bitcoin. Buying now and holding it for at least 10 years would give us a good chance to double our money and that is only a conservative estimate since the price of bitcoin has doubled this year alone.