once when I renewed my visa, I had my rental contract and was sent ti the TM30 office to get the paper TM30 slip myself. If this an old rule and cannot be done anymore? Was at Chiang Mai immigration.
I am pretty sure you can get a document showing you have recovered from covid and are not contagious anymore and have natural immunity (if from U.K., it’s on the NHS app) and can use that. Confirm with Thai embassy.