Welcome to the Bunnings Workshop community @shawnvaz. It's great to have you join us and many thanks for your questions.
You should find this step-by-step tutorial helpful: How to build a retaining wall by @Adam_W. This is how you would raise the soil to be level with the nature strip. Once you have created the retaining wall you would then fill behind it with soil. Depending on how much soil you need to raise the ground level you could to look at ordering some loose-fill mix for the bulk of the material. You can then add a top layer of garden soil and/or top dressing.
If there is a current issue with drainage in the area then I would certainly advise addressing it and installing drainage at the same time as the retaining wall.
You might like to check out these previous discussions: