Damn buddy. I'd either upgrade that cabinet. Or move them all outside. They've got no room to flower in there.
And yes. You can move them outside. A lot of growers actually start their plants indoors and then move them outside when the weather warms up a bit.
I've recently had to move one of mine outdoors. As the area was too cramped like yours. But on a horizontal plane. Not vertical.
Just a hint for next run. Look into training methods like Low Stress Training, Manifoldinding and Screen of Green.
I like to manifold and lst one plant to a very wide. Low canopy. And then flip them to flower once they've either filled out horizontally enough. Or they're about 2 months old. Minimum flip age is about a month. Anything less and they may not be ready. Or yield all that much at all.
Quick question though. What Kelvin is that light? And how many watts?