Can I extend a 30-day Tourist Visa in Thailand for a total of 90 days?

The individual plans to fly to Thailand from Vietnam for about 75 days and is inquiring about extending a potential 30-day Tourist Visa. Community responses clarify that they will not qualify for the Covid extension, as it requires an initial regular extension period before the Covid measures cease. The first commenter suggests applying for a tourist visa in Vietnam which could be extended for a total of 90 days. The second commenter also notes that a 30-day visa exemption might be granted upon entry, which would allow for an additional 30-day extension.