You should prioritize using TikTok Creator Marketplace or analytics tools like FastMoss/EchoTik to filter creators by gross merchandise value and specific product categories. Instead of focusing solely on large accounts, target key content creators (10,000-100,000 followers) with high engagement rates through popular hashtags like #ของดีบอกต่อ (Good products, share them), then proactively contact them directly via Line ID (the most popular chat app in Thailand) to propose affiliate partnerships to optimize costs and ensure effective conversion rates.