Hi Lachy!
Welcome to the forum!
Let's start off by narrowing your stance ~2-4" at the heels. Doing this will make it easier to fix your knee position. Do you see how your knees are riding a few inches inside of your toes? We want your knee and toes to be in perfect alignment. Start with the squat stretch as shown in the video below. Notice the position of Alexis's knees here.