There are different ways to get followers.
The easiest way is to just ask people on here to follow you. I’ve seen the threads that do it and most of the time, it works. Another way is to, like those have said, just follow other accounts. Usually smaller authors and artists would be a best way to start, then slowly build to group accounts and bigger authors and artists.
A couple other ways that require a bit more work are making friends and interacting with people in the community. Instead of just following people and getting random follows, making genuine connections could guarantee secure follows. Meaning, if you talk to them and genuinely are interested in what they do, they will follow you and most likely tell their friends/followers about you.
Gaining followers is all about publicity and social interaction. You can’t just sit there and expect people to follow you without doing some work to get them, if you get me.
I hope this helped! Good luck!