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I’d consider creating a sales funnel (series) of conversions starting from unqualified leads, to MQLs, SQLs, and so on. This will beef up your conversion volume while staying relevant.
You should also set default or adjust the values to be greater for each funnel stage.
Of course, you’ll still only be tracking conversions against the same number of converted clicks so this, alone won’t help tremendously.
I’d try to consolidate some campaigns if possible.
Portfolio bidding and shared budgets can help if you want to keep them split.
