The best way of resolving this is to not try doing this yourself. You should seek out a local, helpful tax agent that will provide good advice, liaise with the ATO if necessary, and prepare and lodge these outstanding returns.
Their (tax agent) fee for service may be substantial but if you are due any refunds then this will help mitigate this. Fees are also tax deductible.
As for amending prior year tax returns, time limits for amendments have expired, so an objection to the expired time limits has to be applied for first.
Time limits on tax return amendments | Australian Taxation Office
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