This can happen if your video that was earning is no longer the most relevant video to content it was previously showing for - or if a site where your video was previously showing decides to replace your video / no longer use Humix. Those are two pretty common examples of why earnings would reduce.
We'd encourage you to use the guides at support.ezoic.com (searching 'humix' yields quite a few helpful results) to understand more about how the Humix video network works and how you can improve your earnings there 🙂
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