U may wan to look into the question whether ur crypto is subject to tax in Malaysia or Australia.
Next is even u have subject to tax in Australia but eventually u bring back to money into malaysia (or in ur case already in Malaysia), the LHDN still wan to tax u as foreign source income but LHDN allow u to claim bilateral credit. however, in most situation u will end up paying extra tax and bilateral credit wont guarantee u to claim 100% of tax pay in Australia.

yes, in Aus there is capital gain tax and Malaysia here don have. so only if ur crypto gain being deemed as business income (ie badges of trade exist) then IRB will wan to take a cut.
pertaining to transfer money back n not being questions, is because not the foregin income tax got holiday period for individual (till 2026). so after that, u may try to transfer again... haha...