Remediating A Seasonal Creek

I have recently bought 20acres in Bendigo, Victoria, Aus.

The property has a seasonal creek running through the middle of it, which probably used to have a lot more water running through it before everyone put in a dam and took a bite. Currently my property has a small dam on the creek, and has been pretty thoroughly cleared. The creek itself has virtually no shade, some moderate erosion, and no ecology. We get just under 400mm of rain yearly on average.

I'm looking for some suggestions as to how to remediate the creek. I would like to keep the plantings as native as possible and create as many habitats as possible.

Try edible acres on YouTube with Sean dumbrowsky, he has videos with similar projects, lots of water retention/deflection designs, his videos have been a huge help to me, and free!