Okay,
@Tony ********
what you WANT to do and what you can legally do within the framework of visa extensions are two completely different things ๐ฎ
So while you might want to stay here for 4 months it sure sounds to me like you didn't really plan it out all that well.
At this time you are not here on a tourist visa but on a 30 day visa exempt entry <- which means you showed up here without having bought a visa from a thai consulate in your country before you winged your way here but because of the country your passport is from you were stamped in for free for 30 days on a visa exempt entry.
Be that as it may you can apply for ONE 30 day extension for 1900baht at the immigration office taking you to 60 days.
Now you MIGHT <- as in maybe after that 30 day regular extension be able to apply for a 60 day unable to travel due do covid extension BUT that is totally going to be up to the office and in some cases the officer you're sitting in front of when you apply. BUT until you slog on over to your immigration office and talk to them you won't know if you can or can't get the covid extension.
Good Luck enjoy your stay (y)