Using thinning shears (they are scissors with teeth.) A 30 tooth should be good. A 36 tooth will be finer - but you probably want coarser.
If you haven't used these - you don't open/close/open/close/open/close. Open/Close, clean out teeth, and repeat in a different spot.
What I would do is cut once or twice about 1/3 up from the blunt edge. This will thin out the bulk in that area.
Repeat 1/4 up from the blunt edge to thin out some more bulk.
Now, working just at the blunt edge, cut a few times, moving the scissors each time, to "soften" the edge.
You can also part the hair as suggested and using the thinning shears soften the length (long) edges and create shape. You can also gather it completely together in the center of the face and thin in a V.
Now, here is the bad news. Several people have told me that forelocks never grow back. Manes will. Tails will. Forelocks, don't. I hope they are wrong.
Avoid straight scissors like the plague. Only skilled groomers can create softness with straight scissors. And any mistakes will be very noticeable with those blunt bangs.
Work slow. Do a little at a time and stand back to assess. The goal you are trying to achieve is not to remove chunks of hair or length but to create softness and the illusion of natural growth. By reducing the thickness above the blunt edge you will create variation in the length throughout and that will also soften the blunt edge.
Post an "after" photo when you are done!!