i'm one of the user who kept the tokens i have like the WAVES that i thought would really keep surging because i have the feeling its the future but things aren't what it seem. it still got a good price compare to ICO price but not what i expect. luckily i stake it for good.
when you learn that bull market is very temporary in crypto, you should watch closely the news whether which one is going to affect the bull market that could turn it over night into bear.
beside news, i think if we understand about technical analysis,, we will know the right time to exit from the market in any situations
usually i use a tools such as fibonacci to predict the target price, for me its very useful tool
other traders use an indicators such as RSI to know if the price already hit overbought zone to know the right sell zone
and don't be greedy