I don't narrate in a lot of detail, but I'll often describe what my character is about to do in the most optimistic manner -- what the character is intending to do. If it works out, great. If not, it's usually amusing to imagine and/or describe the disappointment at failing.
e.g. "I stab the goblin cleanly through the neck!" (roll)(miss) "Or... I stab the wall behind the goblin. How did that happen? Those guys are faster than they look!"
One thing I appreciate about 5E is that the combats are short enough that it's easier to sustain this kind of narration. It works when each combat is effectively resolved within a few rounds. If combat gets grindy, narration also starts to feel forced and repetitive.
e.g. "I stab the goblin cleanly through the neck!" (roll)(miss) "Or... I stab the wall behind the goblin. How did that happen? Those guys are faster than they look!"
One thing I appreciate about 5E is that the combats are short enough that it's easier to sustain this kind of narration. It works when each combat is effectively resolved within a few rounds. If combat gets grindy, narration also starts to feel forced and repetitive.