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It took me about a year to earn $1,000, and the highest I made from a single download was around $21 from a 5-second AI airport video.

It was my most downloaded video, and for three months it was the most downloaded AI video among those from Brazil.

Kind of personal is it not?
It is hard if you want to compare. Your earnings depend on so many factors. Like number of assets, types of assets consumer demands and a lot more. 
Decide for yourself if you are doing what you expected or if it is below your expectations.