@Aiara ****************
>I was wondering if I could extend my visa (?) for 30 days, which would allow me until ~20 Dec and from then try the Covid extention
You do not have a visa, you entered on a bilateral agreement. You can NOT get a 30 day extension of stay based on a bilateral agreement.
>Just so I understand: am I not considered under a tourist visa even after my 1st & only extension?
No you are not. If you look in your passport, under your "admitted to" stamp, you would see something that looks like this:
ผผ90
That is a 90 day bilateral agreement stamp. In pre-COVID-19 times, you'd have to leave after 90 days.