Generally, huge earnings start when you cross ten thousand Instagram followers, and monetization of your Instagram account at that stage becomes very quick and easy. However, you come on the track of making money through Instagram even if you cross 1000 Instagram followers.
It's all about consistent growth, and you need to start somewhere. So, with a lesser number of followers, you'll surely have to put in more effort, but you're well on the path of making your account big if you're consistent with your strategies and practices.