The important thing, then, is to act now. How? We'll explain!
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Here are 4 crucial steps to take to test ad campaigns without third-party cookies:
Identify the objective : setting the final result you want to achieve, such as similar performance to campaigns with third-party cookies, allows you to implement the most effective and efficient solutions to achieve the objectives.

Define the metrics: it is important to decide right away if you want to measure new audiences, different creatives or different communication strategies. After that, you proceed with the execution of an initial test, which could be “prospecting” or contextual, to verify the actual positive impact of the metrics – such as CTR, CPA, CPC and ROAS – on the general objectives of the company.
Determine the ideal budget: There is no fixed budget that works for everyone. Once confirmed, however, you should plan to run the test for at least 6-8 weeks. Obviously, starting to test now, you have the opportunity to understand the real budget needed for the future, as well as the scope of the reach and performance of the campaigns.