eCPM in my adsense at all time low

[terminator]

from few days my eCPM has gone below $1 for one of my high earning sites.
Some channels still have eCPM above $20.
Contextual advertisment is the only option in this niche.

any suggestions?

 

[lylaster]

yea, stop using adsense? there's plenty of other alternatives.

 

[avantrosa]

Could be from the latest content network update where the clickable area is much less.