It sounds like you've barely scratched the surface. I'm no expert, but there's a lot to know in order to get good value from adwords. For starters google "google keyword research". Any keyword which is too popular with advertisers should have too high a price per click, so it can never be profitable. So the art is too build around undervalued keywords. I have no firsthand experience with that.

10L/8 clicks = 1.20L/click. If we assume 1% net conversion rate (strawman number), your customer acquisition cost is about 120L. Is the customer ltv high enough to justify this?