Agree with the above. Don’t mess with things. Stay relaxed, continue to improve your strength/power and hip mobility, and things tend to take care of themselves.
I know more experienced fellows have said not to change anything, but it kind of looks like you’re reaching for the line and collapsing forwards. I used to do that and it caused me to have a braking effect with each step. my times improved greatly when I thought of arching my back at top speed. the end of my race was especially improved…