Reputation compounds. Every honest deal makes the next one easier.

Trust reduces friction, and less friction is worth real money and time. Somebody who has dealt with you before does not need to check everything, negotiate as hard, or hedge against you, so each straightforward exchange makes the next one cheaper for both sides. That effect accumulates slowly and invisibly until it looks like luck. People assume the opportunities found you.

Be scrupulous on small things: the shift you said you would cover, the money you said you would return. Nobody remembers the individual instance. They remember whether you are someone to be careful with.