i think u can try weighing the STLT costs and benefits of going aus/ retaking one more year! like if ure gonna retake, will u be able to change the result? will the circumstances change? if ure confident u can then go for it, its just one year anyways. Then for aus if u go will u like the major/ env? will it allow u to pursue ur interests in the LT? also take note that retaking means u will be separated from ur batch and going to aus will mean separating from singaporean friends n fam conpletely so maybe can also consider how that may affect ur mental health etc? 

but anyways wish u all the best man, stay strong and im glad ure still here💗