@Dmb ******
You’ve had extension of stays for five years based on a 90 days Non O visa and it has to be extended every twelve months. No disagreement so far.
BUT
If you apply for a one year Non O-A multiple entries visa at the Thai embassy of your country of origin. (Not a regular Non O visa). The one year multiple Non O-A Visa itself allows you to stay in Thailand for up to two years before you’ll need to apply for your first yearly 12 months extension of stay.
SO
Regular 90 days Non O visa gives you 90 days before you need to apply for your first 12 months yearly extension of stay.
A one year Non O-A visa from your embassy at home gives you up to two years before you’ll need to apply for your first yearly 12 months extension of stay.
IF
You don’t know or understand this I’m sorry but I can’t help you.