Nobody can "influence" the AVA on your behalf unless you are the son of a big important person, things may be reviewed again. That is a fact of life.
I have given your resume to an employment agent. It is NOT possible for
you to be a vet in Singapore due to AVA's licensing requirements of
accredited vet universities for practising vets and your degree is not
recognised by the AVA. .
But if you are flexible, you may get other industry jobs or even in
Yangon. But the pay is not what you expected and if you are agreeable,
you may get a job e.g. in a vet pharmaceutical company that is looking
for a vet to provide after-sales services for its veterinary products to
vets in Singapore and the region..
I am really sad that you are in this situation but life is full of ups
and downs. Whether you can be resilient or not, it is up to you.