That's why it's a risky investment. It all depends on your risk assessment. If you don't like risk, nothing wrong with your portfolio but you'll grow slowly.
I am not risk averse. I bet big and if I lose, I'm willing to take the loss but since it's not a total gamble, with research you can get an hedge.
So far it's played out well for me but that doesn't mean it'll always be like that. Only thing I can do is research, invest and wait.
> it's all about percentual gains
I disagree. It's all about hard cash. Although the percentage is the same, It's very different being up 10% with 100$ or with 10k$.
How do you decide when to sell?
I have my portfolio divided into long holds (6 months to 1 year, unless something really kills the project) and short term holds (1 month or less).
The whole point of the short term holds are to give me more money to funnel into the long term holds. When I hit a 2x on the short therm coins, I sell half and put the proceeds it into the long term ones.
The rest I let it grow to flip into another short term coin.
Rinse and repeat. It's a conservative approach since sometimes I could sell the short term coins for more than a 2x but I learned not to be greedy.