Well
@Dan ****
Seeing as you can't renew a visa (they just run out when they run out and you go BUY a new one) I think you're asking about going to a thai consulate and getting a new VISA
You can go to the thai consulate in Savannakhet Lao and get a year-long, multi-entry Non-O visa based on marriage to a thai without any proof of funds and with only minimal documentation for 5000baht.
That visa is valid for a year, gives you unlimited entries of 90 days each, when that 90 day stamp runs out you go to the border, stamp out of thailand, stamp in-n-out of another country then right back into thailand to get a new 90 day stamp,. You do that for the whole year the visa is valid for and you get 15 months of stay out of a visa valid for 12.