You are trying to tell a story when you bluff. The story you tell has to be consistent.
That is true BUT, your telling a story in every hand, also when you try trap them with nuts,
and when you have a mediocre hand, and so on,
More important is to also to listen to the other players story.
Dont ignore signs of a monster.
To become a good bluffer you gotta be good at knowing your enemies hands.
To do that, guess the players holecards, also when your not in the pot.
Look whats unfolding in front of you, and try guess hands all the time, and you will
find yourself getting better at it over time
Then its time to make good bluffs