A few ideas that changed how I think about cyberpunk writing techniques:
The Best Cyberpunk Technique Is Making the Technology Feel Like It Was Already There When You Woke Up
There's a common mistake in cyberpunk where writers introduce a piece of technology with ceremony. A paragraph explaining how it works. A character marveling at it. Some variation of "she activated the neural interface and felt the familiar hum of the network."
Neal Stephenson doesn't do this. In Snow Crash, you're dropped into a world where the Mafia runs pizza delivery and the United States has splintered into franchise-operated city-states, and Stephenson never once stops to explain why this is strange. Because to the characters, it isn't. Hiro Protagonist carries a pair of swords and hacks the Metaverse and delivers pizza, and all three of those activities carry equal weight. The technology is embedded in the texture of ordinary life, which is where actual technology lives.
Think about how you interact with your phone. You don't marvel at the fact that a glass rectangle connects you to every piece of information humans have ever recorded. You check whether your food delivery is running late. That's the energy cyberpunk needs. Technology as furniture.
Cyberpunk Writing Works Best When the Interior Life Changes Along with the Hardware
Pat Cadigan understood something about cyberpunk that most of her contemporaries in the 1980s and early '90s missed. The interesting question about brain-computer interfaces, about plugging human consciousness directly into networks, wasn't "what cool things can you do in cyberspace." The interesting question was what it does to the person who comes back out.
In Synners, Cadigan writes characters who jack into the net and produce visual content directly from their minds. When a stroke-like virus starts spreading through the network, it crosses into the neurological systems of the people connected to it. The technology doesn't just change what characters can do. It changes what they perceive, how they think, what they're afraid of. The boundary between self and network starts dissolving.
I don't fully understand why this feels so much more honest than the version of cyberpunk where characters jack in, have an adventure, and come back unchanged. Maybe it's because we already live that story in a smaller way. Anyone who's spent three hours in a social media feed knows the person who puts the phone down isn't quite the same person who picked it up.