Put your ad unit in a visible place. If your ad unit has a reasonable CTR then it is likely to earn more.

Every ad unit has "Your ad here" link that may increase your income. Every publisher that attracts paying advertisers receives half of the fees collected from them (see them in the ad unit's rewards tab, e. g.: https://a-ads.com/ad_units/1/goals).

You can put many ads on the same page if you want, but it won't automatically increase your income.

However, if you attract paying customers to Anonymous Ads or its advertisers, it'll increase your income best.
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