TALK LESS
Most times when you talk too much, it gets to a point when most things you say are not being taken seriously. I've been with people who loves talking even when you are just not in the mood to entertain their talks.
People that talk at the right time are respected with any utterance made by them. Whatever they say is being taken seriously and carried out with immediate alacrity.
So, If you wanna be taken seriously, talk less!