autosabotearse

A common term in psychology and self-help writing for undermining one's own efforts or goals, often unconsciously — autosabotearse el éxito, una relación.

• Muchas personas se autosabotean justo antes de lograr sus metas. — Many people self-sabotage right before achieving their goals.
• El terapeuta la ayudó a entender por qué se autosaboteaba en el trabajo. — The therapist helped her understand why she was sabotaging herself at work.
• Dejar las cosas para el último momento es una forma de autosabotearse. — Leaving things until the last minute is a form of self-sabotage.

Usually implies an unconscious, recurring self-defeating pattern rather than a single bad decision — reserve it for a pattern of behavior, not one isolated mistake.