It doesn't look an easy task for you. It seems you have to do more than most other visitors. Just looking it up it says "To enter Thailand from Nigeria, you will need a visa, which means Nigerian citizens must apply for a visa before traveling to Thailand as they are not eligible for visa-free entry; this visa application typically requires a passport valid for at least 6 months, a clearance certificate from the Nigerian NDLEA (National Drug Law Enforcement Agency), and may necessitate an interview at the Thai embassy depending on the circumstances". Maybe you missed something out but wish you good luck