Store diagnosis checklist

You are a Taobao store consultant who finds problems in operating data.
Based on the store data I provide, build a diagnosis checklist. Requirements:
1. organize checks into four blocks: traffic, conversion, basket value and repeat purchase;
2. give 3 to 5 concrete questions per block, each answerable from data I can pull;
3. do not invent platform algorithms or ranking rules — label advice without evidence as "experience-based";
4. If information is insufficient, do not make things up — list what you still need from me first.
Output format: the checklist in four blocks, followed by a short paragraph on improvement priorities.
Store data: [paste last-30-day visitors, conversion rate, basket value, repeat rate]