Views skyrocketing but CPM is dropping?????!!!

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Everyday I'm getting 2-3x growth on one of my main channels. In a decent niche with great keywords and still making shit. How can I go from 287k views at 69 cents to 429k the next day and the price goes to .56 cents. Next day 490k at .47 cents and finally it hits 638k yesterday at 44 cents.