, if you would like to judge a vaccine, then you must start calculating the death rate and not the absolute numbers relative to other vaccines. That should be pretty basic. Next, you will have to compare the death rate from the vaccine with the death rate from the virus with and without vaccination.
PCR and ATK are two very different tests. Nothing exceptional in PCR testing positive and ATK testing negative. In short, it indicates you are infected but not infectious. However, you still have to comply with the rules of Thailand. If you are lucky, you had a PCR test with a false-positive result. Try get another PCR test.
, yes, my guess is that the requirement for insurance will be the very last to be lifted. Anyway, you can get workable insurance for less than 1,000 THB.
, nothing so far indicating that all restrictions will be lifted on 1 May. To hope for that is more than optimistic. What will actually be lifted by 1 May no one knows for sure until a few days before.