Somehow on this trip I managed to stay 90 days on a 30 day tourist visa. The second time I went to get another 30 day extension, they told me I could not. BUT THEN they gave me a consent form and a Covid 19 form to fill out, in which I had to state how Covid 19 has prevented me from leaving Thailand as planned. So I wrote in something true in the “other reason” space, like “exposure to Covid 19 could delay my departure.” Apparently that did the trick, because I was awarded another 30 days.