When I was a new seller, I consistently received 600 to 800 impressions per day, with daily orders and frequent messages from buyers. However, since achieving Level 1, my impressions have dropped to 100 to 200 per day, I receive messages from buyers only once a week, and my conversion rate has noticeably decreased. Despite ranking on the first pages for general keywords commonly used by buyers, I'm facing these challenges. What could be the issue?