what kind of follower actions are you running? how many followers/unfolow u have per day? to get 100-200 new followers100 to 200 new followers a day.
Engagement varies widely based on niche and the specifics of your tweets. One tip to get high engagement and some organic growth is to tweet Vines, if appropriate to your niche. They get retweeted a lot and over time bring you lots of new followers.