function main() {
  // Campaign Selection
  var campaignName = "Campaign Name"; 

  // Ad Rotation Strategy (Choose one and adjust)
  var rotationStrategy = {
    // 1. Rotate Evenly: Give all ads equal chance
    // "ROTATE_EVENLY" 
    
    // 2. Optimize for Clicks: Show higher-performing ads more often 
    // "OPTIMIZE_FOR_CLICKS"

    // 3. Optimize for Conversions: Prioritize ads driving conversions
    // "OPTIMIZE_FOR_CONVERSIONS" 

    // 4. Rotate Indefinitely: Don't automatically select an ad 
    "ROTATE_INDEFINITELY" 
  }

  // Get the specified campaign
  var campaign = AdsApp.campaigns().withCondition("Name = '" + campaignName + "'").get().next();

   // Set the ad rotation type
  var adRotationType = campaign.getAdRotationType();

  // Apply only if rotation settings need to be changed
  if (adRotationType != rotationStrategy) {
    campaign.setAdRotationType(rotationStrategy); 
  }
}