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Alexander Bromley has some decent content on squatting technique, notably on how to figure out what works for your body proportions & how to ID weaknesses you might have (not that I'm saying you do!). Like Rippetoe he's a bit of a divisive figure and has some odd opinions, but Ive found some of his videos helpful for improving technique
stuff like this:
https://www.youtube.com/watch?v=GMHiv2Z7U7w
https://www.youtube.com/watch?v=lClxajUInz4
TDLR is much the same as what @Chalfie says, make small tweaks that make things feel a bit better
The issue I’ve got is my feet tend to “collaspe” if that makes any sense to anyone. So my thinking is a shoe would create the right form of my feet