Can US flight attendants successfully secure a visa for Thailand, and is it better to use an agency or apply independently?

A US-based flight attendant is seeking advice on securing a visa for Thailand. They are exploring the possibility of using an agency versus applying independently. Some comments suggest that a DTV visa with a focus on soft power through a Muay Thai course might be a viable option, although the job of a flight attendant doesn't support remote work, which is necessary for some visa categories.