1. Focusing on too many markets.
Why? Easy to get distracted, bored.
2. Taking non-plan trades.
Why? Getting impatient. Getting impulsive.
3. Taking profits too early.
Why? Impatient. Fear of giving back.
Is there really anything more? Either we're bored... and make mistakes: overtrade, take excessive risk, oversize...
or we don't take trades/exit early: becoming far too risk-adverse when it finally is time not to do so.
This is the self-mastery part of the game. You push through feelings of boredom by going over the plan... researching... but you cannot deviate from a set plan/pattern.
You must also stop yourself from ending trades too early, limiting every big winner into a tiny winner.
When you conquer impatience and fear... everything will fall into place. But it starts with becoming highly self-aware during the trading day and not merely afterward. You are not the same person trading as at night. So develop a monitor for yourself along with market signals.