The claim you make about your work should fit the result an ordinary customer receives.

Promises are usually written from the best day the work ever had. The demonstration that went perfectly, the client who was easy, the version where everything lined up. An honest claim describes what happens on a normal day for a normal person, not the ceiling of what is possible under ideal conditions. The gap between the two is where disappointment lives.

Look at whatever you say publicly about what you do and hold it against your last several real results. If the claim only fits the best of them, revise the words rather than hoping the average improves.