Update: I reapplied at the same embassy one week later, with 6 months muay thai, via "Issa Compass" agency, and sent more freelance work invoices, and got approved
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TLDR : Answer Summary
The individual initially faced a denial for a 5-year visa due to insufficient course duration (only one month of Muay Thai training). After reapplying one week later with comprehensive documentation, including freelance work invoices, they successfully obtained the visa through the Issa Compass agency. Comments on the post emphasize the importance of proper preparation for visa applications and the need to present proof of the visa upon arrival in Thailand.
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