Make shift castable while casting other spells, like shimmer is for mages.
Make it so you don’t lose your stacks if your collapsing star cast gets stopped, either by you or by knockback or whatever.
Make it so fury drain is substantially slowed down if you get cc’d, including silenced.
Make fury drain and fury generation STOP when you reach 30 stacks while in meta, and remain stopped until you either cast a collapsing star or a timer runs out. 10 seconds, for instance. At that point, fury starts draining and generating once more, and if you fail to reach 30 stacks again before it ends, you lose meta. Reaching 30 stacks again will open another 10 sec window for collapsing star.
Make consume hit multiple targets in aoe situations, or give us another spell that we can use as an aoe builder. Spamming a single target ability into a big pack of trash mobs feels very bad. Balance the damage accordingly.
Make room in rotation to use utility spells when needed without resetting the whole buildup.