The purpose of my account is to promote myself as an authority. I make 2 tweets per day that are very high content. The only links I post are to high-content articles relevant to my niche; I do this rarely. It's a 2008 account, which was just a personal account until this year. I have 8,800 followers gotten through following people in my niche. I have about 1,200 fans gained naturally. I'm getting a natural engagement average of about 8 retweets, 15 likes, and 3 at-replies per tweet. I reply manually to most at-replies asking me a question. I'm currently following/unfollowing 350/day, and so far so good. I wait 5 days to unfollow people who don't follow me back. Can I be more aggressive than this?