First, you should like to read the Twitter following FAQ here.
The way to do it these days is simple. Check them out below:
1. Make sure you post something valuable that others can learn from.
2. Try to follow a number of people each day on Twitter. I like to follow 10 accounts each day.
3. Give it 24 to 48 hours and unfollow accounts that don’t follow you back.
4. Always post information about celebs or notable people in govt of your country.
5. Don’t just retweet, post unique content daily. Even one post is not a bad idea if you do it daily.