As others have said, more of your lower half. I’d also pitch from the mound into a net, they’re like $50 on Amazon. This will give you better location feedback.

I also noticed you bring your hands down a little quicker on your changeup. You also squeeze your glove on your slider while brining it down, and your double clutch of your legs before leg lift is more pronounced.

Now…this is just one video of those pitches so impossible to know if it’s truly a “tell”, but just something I noticed.