Depending on the type of visa or no visa at all you need to have an insurance for covid. There was a list of advised thai insuranceccompanies and a general health insurance. H
most important is: book asq at hotel directly. Mostly you get a confirmation of your request and information how to pay. And what paperwork they expect. Some hotels have regular guests and asq guests. In separate levels of the hotel. Have a look at your booking . Did it mention asq?