Turn your toes out a bit.
When you sit back before pulling, your knees push out against your arms instead of pushing forward into the bar.
This is the way I deadlift with your body shape to be able to still use leg drive and not round upper back TOO much, and allows me to start closer to the bar.
One downside is you have to widen your grip, or risk a bicep tear because when your knees push into your arms it makes your arms bend. With mixed grip that’s bad for the bicep…
I’m not an expert but this is how a coach taught me to fix my round back deadlift.
My deadlift is still far from perfect, but if it helps - heres a recent video when I was trying hook grip, from the front you can see my knees going out: https://www.instagram.com/p/BhlnYPlBblm/?hl=en&taken-by=lifter_dan
If you see my other deadlifts you can see from different perspective