You are correct that it is the problem. Stay where you are until you can afford it.
One way around it is to find, and live, in an Immigration area who will do the Combination Method, as I have done for several years. My IO says that as long as the money in the bank, plus the monthly transfers from abroad add up to over Bht 800k, he will accept it.
I do 40k per month to my Bkk Bank = 480k per year, plus 350k in a Bkk Bank deposit account. Works well.