Just wait the right time when the price of bitcoin will goes up, and take the opportunity that we can buy a lot of bitcoin in low price, so if we buy more now we can have a good investment for the near future.
We must target the market before bitcoin goes higher. Now a days, things are quite easy. Price ranges are quite low so just take the opportunity. Buy low and sell high, simply it will amaze you.
It's like what early investors of bitcoin did, they buy at low price without expecting whether it will rise again but see it did it in 2017 so chances still possible as crypto were not widely use yet.