and here is the standard edit I would apply using one of my own presets:
Which keeps the image quite contrasty, the right is still dark to encourage the view to look over the shoulder of the mechanic in the foreground. I don't normally work with curves because I find the result to be too harsh. I want a reportage style of "In the moment". So rough, over or under exposed, captured movement.
Here is my next edit from scratch and I've incorporated your curves technique of moving the start and finish of the curves line.
Which is a lot more balanced, but i think the colours are now a little over saturated.
And a final go at the orange/teal mix, which I'm not sure works here.
Overall, i've learned something new with the tone curves, I didn't realise you could move the ends of the line and also pressing "o" when using the brush to spot edit to highlight the area being selected.
and now a few pictures in what i would call my "usual" style.