Based from Twitter's FAQ page, you can follow up to 1k Twitter users a day and you can only follow up to 2k users in total. After reaching 2k there will be limits to how you follow additional users. You can read more about Twitter's rules on following here: https://support.twitter.com/articles/68 ... practices#
You can gradually follow people per day and only follow the ones who have the same interest in what you promote. Twitter has the 'tailored suggestions' feature that you can look up to. This section allows you to check out users that have the same interests as yours or you may also use tools like HootSuite.
23 Jul 15 1:39 pm
I suggest you to stop following people on twitter. Create and share some thing useful and interesting, use hash tag and mention to attract people to follow you. Your master strategy for Twitter marketing will generate maximum results only with a strong foundation.
Sandeep Thakur is a Digital Marketing Strategist at FATbit Technologies(http://www.fatbit.com). His professional expertise also covers social media marketing and online branding for individuals or businesses.Follow him on Twitter @SandeepSKTR