You can buy now. For bitcoin it is not a big price right now. But it will recover it's price very soon. If you buy in this time, hopefully you will be profitable. So don't late buy as possible for you. In every day buy little amount and gather it for big hitting.
It is really not very wise to wait for a long time now. The price for most of the cryptocurrencies is relatively low. That is why it is good to make your investments now.