Marketing Strategists provide the advertiser with useful guidelines for future advertising by evaluating the effectiveness of an individual ad or an entire ad campaign after it runs.
Explanation:
Marketing strategists are professionals employed to check and see the validity of the advertising that is being run by the advertisers and check their effectiveness in the ground level.
The usual marketing strategists would come up with solutions for the advertising that are needed to reach out to the goals of the company and also formulate a plant hat they can follow as the advertiser then would make the ad for them.