First impressions get people in the door. Track records decide whether they stay.

First impressions are a loan against a reputation you have not earned yet. It gets you the interview, the invitation, the benefit of the doubt for a few weeks, and then it runs out on schedule. What replaces it is the record of what you did once nobody was impressed anymore. Plenty of people are excellent at the first part and never build the second.

After a good start, put your attention on the boring stretch that follows. Do what you said in week three, when the novelty has gone and nobody is watching closely. That stretch is what people describe when they describe you.