Everyone is ranged, except for the tank.
So you'll want to create some mapped keys for slave movement.

That's an example in my guide, which is linked in my signature.
Basically, take a look at the "others jump" mapped key, and adapt that for strafing, turning and forward/backwards movement.

You'll likely benefit from a spread out key as well.
But as long as you can move the team about, that will help a lot.

With a druid healer, I'd probably Rejuvenation/Lifebloom the tank.
Possibly Regrowth if necessary.
And then Wild Growth the casters from range.

There are macros to keep Rejuvenation up on all team members:

/castsequence [@party4] reset=5 ,,,,,,,,,,,,rejuvenation
/castsequence [@party3] reset=5 ,,,,,,,,,rejuvenation
/castsequence [@party2] reset=5 ,,,,,,rejuvenation
/castsequence [@party1] reset=5 ,,,rejuvenation
/castsequence [@player] reset=5 rejuvenation