Twilight is not broken IMO and at high levels Order is more powerful generally IME.
Twilight Sanctuary is really good, but it is an action to activate and at high level that action is competing for high level spells. As a result after about 7th level Twilight Sanctuary falls off rapidly as powerful spells become available.
When you put TS up against Spirit Guardians, Greater Invisibility, Banishment or Aura of Life it does not hold up well as an action. Still very useful, but more situational.
Voice of Authority is awesome and so is Embodyment of Law. I personally like Fey Touched with Dissonant Whispers on an order Cleric. A favorite tactic is upcasting Command as a bonus action on people caught in spirit guardians to make them waste an action and then making it so they can't escape and either attacking them or dodging as an action. Also Hold Person as a bonus action.
RAW I do not think Bless stacks. So if the RK and Rogue are blessed twice it is still only 1d4.
If you play to high levels the multiclass that shines is Order Cleric 6/Enchantment Wizard X. It is very Mad and takes a while to come online, but Enchantment Wizard gives you a bunch of awesome enchantments as well as an awesome at will action in Hypnotic Gaze that you can use while you throw out spells as a bonus action. When I play this multiclass I play either a Dwarf or a Race with a 35 move so I can dump both strength and dex and wear heavy armor and still move 25. You start Cleric, then 4 Wizard, then 6 Cleric, then the rest Wizard.