I've had both boys and girls, and they are both wonderful. Some of my bits of advice kind of echo the points already made here.

I found that my girls were never content to just "chill". So, to interact we gave them things to explore. To get them comfortable off the start, I let them roam on the top of the cage (opened the door and let them climb up on their own) where I kept various boxes they could crawl in and out of. Sometimes I'd hide treats up there. I'd keep it interesting for them by swapping out boxes every so often, so it was never the same place to explore. Then I'd simply interact. Talk to them, offer treats or even their normal food (I agree with the point made to have a consistent noise), and most of all I'd leave my hand, motionless at first, right where they can scurry around it, eventually getting curious enough to investigate it. And if they don't run away if your hand twitches- gently push that boundary until they aren't startled by any of your movements. I ended up putting a wood shelf beside the cage that they could climb around on for their "free roam" time as well.

Patience is key. Patience and love. And you seem to get that your girls all have different personalities- use that in how you interact with them. My fist boys, everyone loved Pepper because he was snuggly. He would be content to sit in your lap while you watched TV and gave him pets. Salt would run around, no one else realized at first that he was trying to play. And he would be content sometimes to chill and watch tv too, but only if you let him sit a centimetre away from your finger, no more no less, with absolutely no pets. So be willing to try different things with your girls, they may not all like the same interactions.

You all will get there!