i second what beta said
if you're aiming to meet the ad rev barrier (and maintain it) then the best advice i can give you is to split your updates into even smaller chunks, and update more frequently. At least for that one month you just wanna unlock the ad rev for.
Not only you'll get more views per reader, but also potentially more chances for ads to be displayed in your series, and more revenue in return on the long run.
(another benefit of uploading in smaller chunks is once you hit the 70? 71 episodes? you'll be eligible to be featured in their Binge-worthy Series category, which only has a handful of titles they rotate through, even if said titles don't update as much anymore)
i see you already update quite frequently which is a good start. So keep at it : >
as for what the rate is like... i honestly don't know;;; it just fluctuates a lot. i probably need 2 months just to be able to withdraw anything (which is in increments of $100 i believe)