My goal is to express myself more thoroughly. To write longer exposés. To bring out what my Ni gives me.
Hmm. So a matter of communication.
I'd tackle the method by understanding how others work and are different from you. With INTJs you run the risk of them intuitively understanding what you are communicating, which defeats the purpose of being able to communicate by virtue of your competence at communicating.
Although there is no reason so simply go with my suggestions, I do suggest just explaining things to non-INTJs to experience how they deal with learning about new things.
I think you will find Ti has some intresting quirks - that information needs to be more logical and defined rather than derived from analysis of the objective environment. (In an oversimilified sense: booksmart and riddles v task force briefings)
I think you will find with Si that the experience and past practices of the listeners can influence the speed of what they grasp even more so than their capacity for imagination and abstract comprehension.
I think you will find Se will be better be able to grasp your concepts if your vocabulary and speech does not diverge too sharply from what they have come into contact with, rather than rely upon their capacity to simply imagine and through imagination learn.
I think you will find with Ne that the opportunity for novelty and exploration needs to be appreciated, but managed.
Some forms of communication involves identifying the needs of your listeners and meeting them. They have their quirks.
In some ways communication is like counter-intelligence, but without antagonism. It is teaching yourself how to teach. Through the application of listening and unrelenting albeit silent analysis.