Effective writing is one that uses the correct grammar of your language and is able to establish effective communication with your audience, through word choices that are consistent with the readers and their degrees of reasoning. In addition, effective writing is cohesive and conveys messages in a fluid and well-established way.
Regarding my type of writing, I believe that there is a long way for me to acquire perfection, for that I try to optimize my common strengths (clarity, direct and simple language, use of more colloquial words and easy to understand phrases) relation to language and diminish my weaknesses (speed, subjects little explored, prolixity and very short narratives).