there has been talk or rumour that the requirements will be raised, not only financial requurement, but so far seems only elite visa requirement has been drastically raised last year or so. Anyway the mandatory health insurance for retirement visa implementd in2019 was also said to be necessary due to foreigner causing great expense on thai public health service
you can actually write to hospitals for price quotation and comparison if you like, there are also youtube videos on these topics, at your young age health insurance is not so expensive (i'd say v expensive after sixty or so) but as general rule preconditions are all excluded
guess you need to choose region carefully esp with regard to air pollution (there are many apps to download and check real time air quality). private hospital care of course very good but at a cost