Me personally I never do anything like what you have setup directly under your feet. I just go flat on the ground. Your ankle mobility seems hindered, either because of a lack thereof or because of that wedge setup. I'd try some ankle mobility training to help you manage squatting to depth.

You're on a non vertical Smith machine. The ramp below the feet only promotes backward movement of the hips. This leads to your shoulders being way out in front of your center of mass. Best advice is turn around, or don't use a Smith.

gotta be trolling

The smith is fucking you up I think. Try it free weight but make sure to keep the weight in the middle of your stance not out in front like this. Also probably ditch the slant board when starting, front squat is much more core and balance intensive don’t wanna get hurt early.

Definitely should be heel elevated… not tie elevated. A smith machine will not allow you to have the correct angles.

Because it is wrong. If there's no barbell use a dumbbell for goblet squats instead. If there's barbells available I'd work on your front rack/do zombie front squat. Ideally to a box if you can't hit depth right now. If you don't need the slant board don't use it.

The number one thing you should do is squat empty bar. Remove the wedges, and turn around

Turn around, you don't want the bar traveling away from you.

To far back, lifting heels, engage core.

Your feet