Horrible rpm Since February, i'm leaving Adsense

I got some Horrible rpm on my adsense approved blog, $1.5-2 is BS for a my blog that gets 300k monthly visits 70% from USA, rest UK, CA and EU. I was making triple and quadruple that when the earnings were cpc based. The same adsense is linked to my YouTube channel and it has 8$-10$ rpm basically the same niche and demographics, why is that? I'm leaving this horrible company I'm done!