Set it as a number, not a feeling
A daily loss limit expressed as a dollar figure is enforceable. One expressed as when I feel off is not.
Make it hard to override
Write it in the journal before the session, and close the platform when it is hit. The trade you want after three losses is almost never the plan.
Review, do not renegotiate
If the limit is hit repeatedly, the problem is usually size or setup selection, not the limit.
Educational review of a past session. Not financial advice, not a recommendation, and not an indication of future results.