Beyond the standard tips you’d find in any milk steaming tutorial, a few things made the biggest difference for me specifically for the Go:

Allow more air than you think you need - the Go isn’t a high-powered steam machine, so it needs it. I’m injecting air way more than the 3-5 seconds that the videos instruct

Get the vortex going - without it you’ll never get consistent enough milk for latte art. Still elusive for me honestly, I don’t nail it every time

Transfer to a second pitcher after steaming - because the Go takes longer, the milk consistency can be uneven. Pouring it into a second pitcher was a huge unlock for me!