In the classical market, yes, but in the current circumstances, the price of a coin can increase severalfold simply because of the hype on the forum or pump groups, so this is a controversial issue.
Especially in the altcoin market. If we look at Bitcoin's market, even the best possible traders couldn't have seen this major bull run coming. If we had to believe various well educated and high level traders, it was time to secure profits on various levels, and in all cases they have been wrong. It's even safe to say that probably 99% of the speculations have been wrong in the run-up to the latest bull run, and those who were right, were just guessing without any actual logical sense to back it up. It just shows that holding has been the far better option overall, especially in the last year. Trading in current market requires you to take more risk than ever before....