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“Bidding – Maximize conversions (this was changed from maximize clicks in November to try and fix this issue)”
You’re reversing the order. To generate conversions, you need clicks first, not the other way around. The tendency is for your CPC to increase and for you to end up with even fewer clicks. That’s basically just burning money.
What is your impression share? In your case, it seems like a problem of overly narrow targeting and low search volume.
