Perhaps you've already fixed this, but:
Clamp some flat-bar to the red area and start to hammer the lip down flat - this will make the whole area stiffer for the next step. (obviously you can't do that the whole way to the tip due to the bend) Use your judgment for where having the lip helps, vs fights you to straighten the whole thing - this depends on how much twist is in the green area.
Attach a 3/4" Pony pipe clamp at either of the blue lines (simply depends on how it'll fit in there) and clamp to somewhere up at the engine crossmember that is stronger than what you're pulling here. (I can't speak for other brands, but I've abused Ponys for years and they are extremely durable)
After you have some tension on it, give a few well-placed hammer hits. Be aware the pipe clamp may pop up when the metal moves. (ziptie or bungee it to that availabe hole?) Assess, re-tighten the clamp, hit it again.
Cantilevered metal like this wants to absorb the hammer's energy via vibration, so the tension of the pipe clamp helps with that.
But the pipe clamp alone likely will not provide enough pull, so needs the hammer.
Intentional, well-placed hits will be your friend.
Then finish reworking the lip when it's all moved straight.