Monetizing 40k unique views with only Adsense, is indeed not the best method to earn well.
Why don't you try, since you own a popular viral website, CPA related lockers.
In case you own a viral video site:
Step 1: people (40k unique viewers) will click at your site to watch the video they want/searched for
Step 2: A locker (maybe you already own a social locker) will pop-up and people will share/tweet/whatever to continue
Step 3: (or Step 2 if you don't like Step 2) a CPA locker will show when people want to view the video or view it longer than *amount of sec here*
Step 4: Thanks to Adsense you'll get paid per click at your advertisements and thanks to CPA you'll get between $0,05 - $25 per lead (from India with $0,05 to Switzerland with $25 per lead)
If ONLY 10% will click at the offers and 10% of those people will actually fill in a survey, that will be around 400 leads from 40k unique viewers. 400 leads x $1,50 (maybe when you target USA it's about $1.70 per lead) = $600 per month extra (when everything goes as planned in my example).
You could also build an email list from those viewers and start with email marketing combined with Clickbank maybe?
Anyway, I hope you got now some ideas how to monetize your traffic!
I was good at turning views into leads, but getting traffic is my issue.. so I hope we can help each other some day perhaps.