I sympathise with your situation, but you are simply out of luck.
If anything, Thailand has been over lenient in allowing existing Test & Go entry when they know many who test negative on arrival are in the early stages of Omicron infection that has not yet progressed to the point of a positive test. Frankly, retaining the Phuket sandbox is dubious. If I was on Phuket, I would not be too happy knowing there are many recent arrivals walking around spreading a highly infectious virus.
Most likely, within the next two weeks, there will be greater clarity on how bad the Omicron outbreak is going to be in Thailand. If the worst fears are not met (in particular, if hospital admissions remain low) Test & Go might be reintroduced as early as February. My advice would be to stay where you are for the moment, hoping for a better opportunity at a later time.