What should I do after my Australian immigrant visa is rejected?

Specific situation, specific analysis.

First of all, we must understand the specific reasons for refusing the visa.

Generally speaking, as long as it is not because of false materials, you can re-apply for a visa and it is possible to sign it.

The key is to supplement the corresponding application materials according to the reasons for refusal.

Then, sort out the previous application materials and submit the application again.

If the reasons for refusing the visa are incorrect, you can also appeal.

Good luck!