Unlucky with Thai holidays, there are so many in a year..far too many imo email them, they will read it and won't reply but it should nudge them along GL
Just fly somewhere nice like HCMC for the weekend, not expensive, experience another culture, very inexpensive too. (Unless you don’t like flying) 🤷🏾♀️
If one of you can do a remote work business (not doing any business with Thais/Thai companies) then that might work to apply for DTV but not if you are both retired, or going to be doing business within Thailand ie. Buying a condo to rent out etc