Don’t just let your Twitter account sit there and expect to garner followers. You need to put the work in and follow others, too.
Some follow the Tweet-etiquette of following accounts back as and when they follow them. Identify accounts in your area and even look through who your competitors follow and who follow them to get people following you back.
Don’t be afraid to retweet and like others’ tweets, too. They will soon start to do the same for you.