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Some simple ways you might fix this, if you want to.
One: do a 50/50 mix of chaos black/dark angels green, watered down a bit, and paint towards your highlights from the edge of the chaos black areas. This allows your touchup to be relatively imprecise and yet I've found it an effective tool. Plus it can add some richness to an otherwise flat black colour as even cold black colours are better than flat black.
Two: paint over the highlights completely, and do what I finally figured out how to do... rather than trying to paint the edge with the tip of the brush like this: ----| instead use the side of the brush and draw it along the corner of the edge you're trying to highlight. No matter how your hand may shake, it's almost impossible to get anything less than a fine line out of that. oh, and when highlighting like this, less paint on the brush is better as it tends to pool at the point of contact. you're looking for an angle like this: |< where the < is the tip of the edge you're highlighting and | is the side of your paintbrush.
Three: water down chaos black, probably 75% water, 25% chaos black and wash it over your highlights to dull them down. They should still be visible but less garish.

First: your painting is not bad. When I first started painting like 18 years ago I couldn't dream of painting anywhere near the quality you've produced here. Even 10 years ago I'd have been hard pressed to approach your quality. Five years ago, I might have felt I was a comparable painter to yourself. There's nothing "bad" here. It's all a learning curve. I have only in the last few years been producing what I consider quality paint jobs, and given my compulsive nature, this has slowed down my painting process, to the point where I have collected well over 200 figs and have almost 5 figs painted. You need to refine things, but that's not a bad thing. Don't get down on yourself. You're well on the way to becoming a good painter. I congratulate you first on seeking advice, and secondly on appreciating the advice you've been given. Those are qualities that will stand you in good stead.