@Rong*****
okay, sadly, now you're just making excuses :(
GO to or call the Krabi immigration office and see what they say.
I would wager they'll say seeing as you waited this long, you should just take the amnesty and follow what the government tells amnesty holders to do once it runs out.
Even if you go back and get the second stamp, the covid-19 extension was only for 30 days so that stamp would be expired when you got it AND
I don't know any immigration offices that will issue an in country Non-Immigrant visa from an amnesty stamp.
Still, good luck, take care, stay safe (y)