Soft option, have your Dr write up a treatment schedule for the next 6 months - appointments, treatments, and proper timeline. As long as you dont work in thailand or for a Thai company you are within the guidelines.
If your staying near a land border you can also do border run through agency and get more 60 day exemptions. You can only "fly" into thailand twice a year, but land entries with support of Thai business is 60 + 60 + 60 ... 3000-4000 for border run.
Nothing gets done during TET in Vietnam. You might want to reschedule ... Thai embassy will be open but none of the vn govt or businesses that the Thai embassy uses will be open until the 1rst of February.
Fight EVO360 Thailand - Thepprasit Boxing Stadium great for DTV. They have all the proper documents, very easy to work with 20k for 6 months. Can answer all of your questions
or the applicant made an error in his application ... This is more likely, as no embassy will ask a soft power for income - but they require tax returns and income statements for digital workers ... Check all the group's and especially the Thai embassy website, they won't ask for income for soft power. They didnt ask for income, but bank statemnents in the original post, so the applicant must not have uploaded 6 months of statements. But why your arguing with me is confusing as I answered the op questions - no one needed your input, at least not me.