Leave the space better than you found it. People notice who does, even if they never say it.

Every space you pass through keeps a small record of you: the chair pushed back in, the wrapper you picked up that was not yours, the kit put away. Nobody mentions it, which makes it easy to assume nobody saw. Adults in particular keep a quiet list of who leaves things better than they found them. That list decides who gets asked, trusted and recommended later.

Add thirty seconds to the end of the next place you leave. Straighten one thing that is not your responsibility. Do it without checking whether anyone noticed, because it works either way.