Say The Thing
Each day, tell one person something good you have been thinking but not saying.
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Why this one
Specific appreciation is rare and cheap, and people remember it for a surprisingly long time.
The rule
Each day, tell one person something good you have been thinking but not saying. For 5 days. That is the whole thing; there is nothing to sign up for and nobody is tracking you.
Post the card on day one so somebody knows you started. That
is the only accountability mechanism that reliably works and it is free.