@Danny *********
ok, IF you have a non-immigrant type visa you use Chaengwattana for ANY type of extension you're getting from it.
As people pointed out you can ONLY get one 60 day "visit family" extension so your two options are meet the financial requirements and apply for a year extension OR apply for a 60 day unable to travel due to covid extension. Chaengwattana is where you go if you're in Bangkok, Good luck