If you’ve stayed here 6 months? Your probably be pulled aside have all you requirements,onward ticket in 60 days ,2OK baht or equivalent and accommodation
My neighbor has been coming and going every other month for 20 years and not really any problems once in awhile he’ll get questioned but no problems same as the offshore guys
you can come on an exempt stamp and change to a non-o in Thailand for the year extension based on married to a Thai you’ll need 400K Thai baht in a Thai bank in your name two months before the extension if for retirement you’ll need 800K unless your embassy issues a income letter