Specific appreciation makes care visible
A general thank-you is kind, but a specific one shows what you noticed. Thanking someone for waiting while you finished a difficult call identifies the action and its effect. It tells them that their effort registered, including work that might otherwise pass without recognition.
Go deeper
Name the action and what it meant
Someone rearranges their afternoon to collect a package for you. Saying thanks acknowledges the favour. Adding that it allowed you to finish an important task makes the appreciation more concrete.
Specific appreciation connects effort with impact. It can include what the person did, the situation in which they did it and how it helped.
This does not require elaborate praise or a speech. One accurate sentence is often enough. Exaggeration can make a small, sincere acknowledgment feel less personal rather than more meaningful.
It is also useful to notice quiet contributions: checking a detail, making space at a table or remembering an agreed arrangement. Appreciation need not wait for an exceptional gesture.