How to become a brand ambassador or brand model?

I been thinking about becoming a brand ambassador and I wanted to know the steps or where to start. I’ll admit I’m not a very social person but I think I could easily gain a following if I became more active online n posted pictures. I tend to notice I can draw attention easily when out in public and people seem to be intrigued by me or asking me about my tattoos or clothing. So what are the steps and methods?
How to become a brand ambassador or brand model?
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