Relying on random signal for your trade is detrimental, first thing first, the signal giver probably already bought the coin at the bottom and giving signal for the sake of pumping it, taking advantage of you for exit liquidity, the copy trading also exposed to this kind of risk as well.
second, the signal giver probably just giving some random signal that he himself not even buy according to his own signal, so you're just a test subject in this regard.

the people you mentioned that could profit consistently in trading within short term learning probably those people that already have mental resilience and can manage their emotion good, for example a people with good trading aptitude and mental resilience will try to fill their bags when the market is in red, while the people that are weak and don't have the it factor for trading usually just gonna holed up in fear instead of buying afraid of losing more money.

just see previous bearish as an example, the people who bought at $20k are the chosen people with good mental resilience, i still vividly remember back then many paper hands are calling that crypto is doomed.

so your question
yes, psychological behaviour does contribute a lot to profit generation in trading, i could even say that it's the most important thing, you can be having extensive experience and knowledge but if you're so afraid of things going south you probably never ever gonna trade at all.