You do not have to announce what consistent behavior will eventually reveal.

Consistent behaviour is its own testimony, and it arrives on a slower schedule than announcement. Telling people who you are asks them to take it on faith; showing them repeatedly makes the conclusion theirs. The second is slower and far more durable.

When you feel the urge to state something about your reliability, generosity, or competence, try letting the behaviour speak instead. Give it months rather than days. Reputation built this way does not have to be defended.