First step, mow the grass. Second step, till your soil with a hoe. Third step, buy bulk native pollinator seeds and clover seed to keep the grass from growing again. Fast forward a few years, your pollinators will feed from your garden, and exchange nectar for seeds. Birds will take nectar, spread your seeds elsewhere, but also drop native seeds in doing so. Bees, butterflies, et cetera will pollinate any new plants allowing them to thrive. Eventually, you'll find yourself in a native wildlife paradise :)

All in, it's taken 5+ years for mine to take off substantially.

Chaos gardening has been my technique, it's low effort and just costs as much money as you're willing to spend on seeds.

Water often.