You cant get the covid extention again because you've come off a Non Imm visa. You can get 7 days from the 15th March for 1900bt then you gotta leave the Country or get tangled up with dodgy agents
To get the ME Non Imm O based on marriage you need a Thai spouse, it doesnt require any funds in a Thai bank but be aware that many Embassys/Consulates only issue the 90 day Non Imm O visa.