Titles are a big achievement. Some taking overcoming hard challenges or persistence across multiple seasons. But after getting a title it doesn't do anything for you. Have titles actually mean something in game! It doesn't have to be huge, like for "Unbroken" how about more XP in the crucible or increased crucible rewards. Or "Shadow" 5% damage reduction against hive. Triumphs and titles are a decent portion of D2, give players more incentive to go after them!