Experience becomes legacy when it keeps helping after you stop speaking.

Anything you know only reaches as far as your own voice unless it gets embedded in something that outlasts the conversation. A written note, a taught habit, a way of working that others carry on, a person who now thinks differently. That is what turns experience into legacy rather than into a store that closes with you.

Pick one thing you know that would be genuinely useful to someone after you. Put it somewhere durable. It need not be elaborate to keep working.