Okay, we’re going to get through this.
The first thing you need to do is dye it all one color (close to your natural color) so everything generally blends more. Then just start growing out. Once it gets long enough that it starts to look weird, kind of gel it back. Once it gets as long as a short haircut go to a stylist and have her layer/blend it and cut the long part to medium length with layers. Return to said stylist every 4-6 weeks to make sure it looks okay as it’s growing out.