〜ことにしている means you''ve made something a personal habit or rule. It''s a decision you actively maintain.
Personal habit - Something you''ve decided to do regularly
Self-imposed rule - A policy you follow
I make it a habit to exercise every day.
Related: ことにする (decide to), ことになっている (it''s expected/scheduled)
Different from ことにする (one-time decision)
- ことにする = decide to (single decision)
- ことにしている = have decided to (ongoing habit)
Negative: ないことにしている = make it a rule not to
I make it a rule to always eat breakfast.
I make it a rule not to look at my phone late at night.
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