You also can ask for a Non imm. O MULTIPLE Entry in your home country. Then you need only one border bounce to get another 90 days. (Visa is valid for 1 year and every time when you leave and come back you get 90 days as long as your visa is valid)
If you have enough money in your Thai bank account (800k฿ 2 months before you ask the year extension) it's ofcourse possible to get a year extension. Maybe also ask a re-entry permit then, should you come back within that year.
I think it is wise to legalize your American marriage in Thailand too when you are here. This for future use ? ('Only' 400k฿ in your bank account needed or 12x 40k฿ per month as international transfer instead of 65k฿ per month
@Ken ******
.)
When you legalize it here there is also an option to get 60 days 'visiting family' (your wife). Good luck with your decision.🙏