Place it at the very end of a sequence, after the final action has happened, so it closes the edit rather than starting one. Use it once, as the closing beat, and let the finished result stay on screen after it.
Über diesen Sound
This four-second clip is a single spoken line, 'I am complete!', presented as a short statement of finishing something. It feels satisfying, like a task finally done, and it gives a small sense of closure after a long effort, a win, or a result that took time to reach.