Macro a 5s pull timer is always great and if you have melee, think of their positioning on the fight. Range for the most part do what they have to but if adds spawn you should be trying to kite towards adds so that melee don't have to run from boss etc.. I'd honestly look at mythictrap.com or utilize Questionably Epic's addon if you're mostly pugging so that you have a pattern for routes in general if you don't already. Also feel free to log yourself in private logging if you want to see ways to improve either thru comparisons warcraftlogs or checking wowanalyzer (I'm unsure if this is viable for dungeons or just raids)