Bitcoin, ethereum and some other cryptocurrencies  will hit all-time-high again. But up till now, there's no clear technical or fundamental indications that this will even in the next two years.

Technicely, the second half of 2019 would even be more boring than that of 2018. Markets will be slow, volatility will be slim... traders wouldn't make much at that period.

Which brings me to the topic - why 60% OF CURRENT CRYPTO HOLDERS MIGHT NOT CATCH THE NEXT BULL RUN

The answer to this question Is straight forward:
over 60% of cryptpholders are newbies...because market will be flat in it's low for over 11 months... this period of flat market movements is enough to burn those 60% out... particularly those who went all-in

WHAT CAN BE DONE TO AVOID THIS?

Well, the only thing that can be done to avoid this, is to prepare for a long boring market. Investing what you know you wouldn't need to touch for years. Have something that would sustain you, such that you don't go broke, hence having to tap into your crypto-portfolio.

Simply find a small job to do, while the market flattens out. Hold your portfolio at the bottom, and the markets will thank you at the top😎