You're trying to improve an ad's perceived quality so it performs better during an ad auction. What change would have the least-positive impact to an ad's quality?

Raising the bid amount directly impacts Ad Rank, but it has the least positive impact on an ad's perceived quality. Ad quality is primarily determined by factors like expected clickthrough rate (CTR), ad relevance, and landing page experience. Creating ads relevant to keywords, crafting ads likely to get clicks (which improves expected CTR), and having a clear landing page all directly contribute to improving these quality factors. While a higher bid can help an ad show more often, it doesn't inherently make the ad better or more relevant to the user, which is what perceived quality measures.