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Gaining followers is a funnel. Almost everyone who chooses to follow you will do so after visiting your profile. In your bio and/or pinned tweet, tell me something interesting about you, and what I'd get by following you.
Unless you're already a celebrity, make your timeline about yourself. Retweet rarely, including quote retweets. People are most likely following you for your own story, not for your comments on other people. Okay to break this rule sometimes.
Unless you already earned enough credibility, nobody cares about your opinion, your advice, the cause you want to support, etc. Focus on revealing things you yourself would like to see from others.
Sure, it's quality over quantity, but the quantity can't be zero. Make it a habit to spend 30 min each day thinking about what happened during your day that might be worth sharing, and if you think of something, spend another 30 min preparing how to share it.
People will avoid interacting with you if they suspect you're a bot or someone who has something to hide. There are definitely anonymous accounts who managed to become very popular, but it's a lot harder.
When you start, you're a nobody. You're unknown and you have no credibility. You only start to earn attention and credibility by giving people something they want: Information, inspiration, entertainment, encouragement, etc. Give, give, give...