What are my options for extending my stay in Thailand after my Non-O marriage e-visa expires?

Okay you hold a year long, multi-entry Non-O visa based on marriage which gives you unlimited entries of 90 days each during the year it's valid for.

When your 90 day stamp runs out, you have THREE choices

1 - meet the financial requirements (400K baht in a thai bank account in your name only for 2 months before you apply) and apply for a yearly extension based on marriage at the immigration office for 1900baht

2 - apply for a 60 day visit thai family extension at the immigration office for 1900baht

3 - exit/re-enter the country to get a new 90 day entry stamp (meeting the entry requirements of the country you're going to and thailand to get back in)

There is no requirement to be out of the country any length of time, many people on that visa go to the border, stamp out of thailand, stamp in and out of another country, turn right around and stamp back in to thailand to get another 90 day entry stamp.

You will need a NEW thai pass approved to get back in to thailand but you can apply for it before you even go to the border (as long as you pick the crossing you're comin' back in to thailand on when you apply)