The primary reason someone originally follows you is because you followed them, so your first task is to seek out those interested in what you share and follow them. Retweet what you find most interesting of what they've shared. Interact with them. That is why it is called "social" media.

If you don't tweet at least once a month anyone doing Twitter seriously may unfollow you. Consider feeding content that is most interesting to your followers. Usually that would be similar to what you tweet about, but produced by others. One way to do that is explained in How to Use Twitterfeed http://growmap.com/how-to-use-twitterfeed

There are tips, how-tos, strategies and videos for anyone from beginners to advanced Twitter users at http://growmap.com/twitter-best-practices

If you would like one-on-one training or assistance in learning or setting up any of these strategies give me a call.