There is real value in being someone whose statements can be taken at face value. When people do not have to interpret your tone, weigh your sincerity, or work out whether you meant it, dealing with you becomes straightforward, and that straightforwardness is rarer than it should be.

Cut the habits that create doubt: the joke that might be serious, the agreement you do not mean, the yes that is really a maybe. Say the plainer version even when it is less smooth. People will trust what you say precisely to the extent that they have not had to decode it.