You can try to be humble and acquire your first 100 followers organically through proper engagement and writing articles.
Ooorrr you can be an asshole and hit it quick and dirty by doing follow 4 follow everyday to the max 125 accounts. Surely most will follow back AND if you follow accounts that clapped for "how to get 100 followers" articles you have a MUCH higher chance of attracting followers back. Just a big FYI to the whole world out there 🤣