You need 12 months consecutive for the income route otherwise it’s 400k 2 months before your application date NOT 2 months before your extension/ visa expires
Apply Non-o in home country. On arrival immediately open a Thai bank account and put 800k baht in after 2 months apply for 1 year extension and leave money in for another 3 months. Cannot go lower than 400 k and MUST be back to 800k 2 months before the day you apply for next extension NOT the day your previous extension finishes