Yes, you can still buy cryptos low, and sell higher, new projects are coming out frequently with great potential. I think we are scratching the surface of what the Crypto market will become.

Forget the buy low sell high mentality. Short sighted views, and fear is why people are losing money right now by getting into something with known volatility and then making bad calls. 

Unless you know what you are doing reading trends, and even then with a degree of luck this is still risky. This ain't the stock market, the same rules don't apply.

I've been investing various amounts since Oct of last year. It's had its ups and downs, but coming out with 78% profit on initial investment beats any traditional fund hands down(It's been as high as 400%, but that's the nature of the beast).

I've been in stocks for about ten years, and still invest in both. 

Find projects that are going to be around in 5-10 years time, and are already changing the cryptocurrency landscape. Education and knowledge is what's key to doing well. Forget reading graphs. If your confident in what you invest in, you won't ever make panicked decisions.

As for the current slump, the year is only just getting started.