white + black

I am in the adult niche. i have been having an issue and am not sure how to resolve it. i will rank for keyword then i disappear. after a month or so. The domain is one year. And KD is below 30. What can i do to gain authority. am trying to reach 10k user per day and currently at 3k per day.

Some combine clean sites with controlled aggressive tactics. Is this hybrid approach giving better results compared to purely white or black methods?