Yes and No,
as a trader our biggest goal is to secure the profit,
i say yes because when the price is high and slowly retracing,we should try to secure our position(capital+profit).
how to identify it ?
there're a lot of things and clues that we should understand how to read the market,the simplest way is when the price hit all time new high.
a few days or hours later another 'big' crash happen usually another downward movement will follow.
just like right now,
i say no,because a few days ago Bitcoin is at its peak,
and every altcoin is drowning,right now is the best time to load it because when the price is retracing.
every altcoin should get some pump.
but it's very risky because not many people understand how to read it.
you may lose it instead of gain from it
Yes it is possible, instead of gains you may lose because of thia retracement happenings. You must also be aware of the trends in the market, as simplified most of the tokens are related to bitcoin's price, so whatever happens to bitcoin upward or downward trends, still it will be affected. The main goal for a trader was already stated above, so keep it in mind, do not settle for a lose.