There is no absolute minimum size to be considered an influencer. It all depends on your specialty niche and the engagement level of your followers. A brand would rather have an influencer who regularly engages with her audience, and who succeeds in having people share her work on a regular basis.
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1. Create an enticing bio that makes people want to know you better
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2. Post regularly and engage with your commenters
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3. Build relationships with other influencers in your niche
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4. Use platforms (like the MNFST app) that work with #influencers and brands
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5. Create #UGC (User Generated Content) and tag brands to let them notice you
Instagram provides a fantastic opportunity for ardent Instagrammers to make a living from their hobby. If you can establish yourself as an expert on something and can build enough influence, to be considered a favorite, you have the potential to work with brands to make money.