UI is very cluttered, you could clean up so much. Try:
Do you need to know the duration of the well-fed buff on your resto shaman? Get rid of party frames.
Get rid of recount dps graph, 100% pointless.
Clean up the appearance of your ability countdown meter and action bars.
Scrolling combat text... so many UIs all have the same one terrible feature and that is scrolling combat text addons. The ONLY use that a SCT addon has is to clump aoe spell effect reports so you can see how many targets your aoe spell is hitting. Do you really need to have a huge clump of text pop up in your eyeline to inform you that your pets waterbolt just hit for 4k? Your leech just overhealed you for 30 damage, get rid of healing reports as well and use skada or another addon to check death logs.