You could of applied online for a none O visa before you arrived in Thailand this would of allowed you to open a bank account in Thailand and get a 1 year extension. The only way you can fo it now is to pay an agent
My friend just returned for the 2nd time this year after flying out and coming back after 7 days ,immigration told him this is the last time you will need a visa next time.
Look at the 6 month multiple entry visa ,it allows 60 days at a time then you can leave and return for another 60 day for 6 months or extend the 60 days to 90 twice you can get 9 months out of it if required by entering Thailand a few days before the 6 months is up and getting another 60 days then extend to 90 days ,you pay your money and take the chance
tell the bank that, I have just renewed my visa first 1 year they froze my account while my visa was being renewed I have a 1 year retirement visa until October this year and have just renewed it