It's true. I bought everything first time. I lost money
But as long as they werent scam/junk coins, and you didnt sell them realizing your loss....they will go up. Ive been mining and at this off and on since 2011. I mined bitcoin at $0.30 sold for $36 and thought I made a fortune. I had 2.4Million doge at $0.000033 and sold them for about $240 thinking I needed to salavge what I could before they were worthless...last week XDG was at $0.015, had I held them two more years it would be worth $36,000.
If you bought good coins and hold them long enough and don't realize the loss...it will come up. The brightest and wealthiest minds are flocking to crypto and the companies that surround them...Blockchain is here to stay.
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But I too do follow the 1/5 strategy for cost averaging. Then again when I saw the huge Chinese New Year dip occur last week for the 4th/5th? year in a row...I bought heavily. Every year it catches me by surprise, and then its like, oh yeah, I went through this last year, I'll need to remember this for next.