How would you handle a sudden decrease in conversion rates despite maintaining consistent traffic and ad positions on Yahoo! Japan?

A sudden decrease in conversion rates, despite consistent traffic and ad positions on Yahoo! Japan, warrants a systematic investigation focusing on factors impacting user experience and competitiveness. First, immediately analyze landing page performance for any technical issues, such as slow loading times, broken links, or mobile responsiveness problems. These technical glitches directly impact user experience and can drastically reduce conversions. Next, review landing page content and messaging to ensure it aligns with current promotions and customer expectations. Changes to product descriptions, pricing, or calls to action may be negatively affecting conversions. Examine the competitive landscape. A new competitor entering the market or existing competitors launching aggressive promotions can steal market share and reduce your conversion rates. Monitor search query reports to identify any irrelevant or low-quality traffic that may be diluting conversion rates. Add negative keywords to filter out unwanted traffic. Evaluate ad copy relevance and messaging. Ensure the ad copy accurately reflects the landing page content and is compelling to the target audience. Test different ad copy variations to improve click-through rates and conversion rates. Analyze audience targeting to ensure it is still aligned with the target demographic and their evolving needs. Adjust targeting parameters as needed. Verify conversion tracking is functioning correctly to accurately measure conversions. If tracking is broken, the perceived decrease might not be real. For instance, if a technical problem is identified on the landing page that dramatically slows load times for a new phone version used by many customers, fixing the technical issue will most likely restore the previous conversion rate. A methodical approach is needed instead of simply randomly guessing, as a single issue can have major impacts.