autosuggestion; self-suggestion
A psychological technique of influencing one's own thoughts or behavior through repeated affirmations or mental conditioning. Often used in self-help or therapeutic contexts.
You can build confidence through autosuggestion.
Every morning, he practices self-suggestion in front of the mirror.
暗示 is a broader term for 'suggestion' or 'hint', while 自己暗示 specifically refers to suggestions directed at oneself.
Compound of 自己 (self) and 暗示 (suggestion). The term is a direct translation of the English 'autosuggestion', popularized in early 20th-century psychology.