I came in with a tourist visa changed it to a non o 90 day and then you can change it to a retirement Visa which is a yearly Visa or sent you are married to a Thai you could change to a spousal Visa. For retirement Visa you need 800,000 in the bank or show 65,000 baht income coming into Thailand every month. For spousal Visa need
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0 in the bank or 40,000 coming in every month