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>Conversion tracking only for a certain asset level and above
This is usually the best way to do it. Show the algorithm what’s a good conversion and what isn’t. You can either do this by only tracking relevant conversions (if that’s possible) or by using offline conversions and optimizing toward converted leads or conversion value (put 0 conversion value for irrelevant leads).
You’ll never be able to completely get rid of these leads, but it can help the algorithm optimize. Also, with the data in the account, you’ll easily identify search terms that just don’t work for you even if they make sense in theory.
