Formal:
* Committed to
* Devoted to
* Given to
* Entrusted to
* Assigned to
* Consecrated to
* Aimed at
* Focused on
* Centered on
Informal:
* Into
* Keen on
* Passionate about
* Crazy about
* All in on
* Big on
* Sold on
* Hooked on
* Crazy for
Other options:
* In pursuit of
* In service of
* For the sake of
* With a view to
* In support of
* In honor of
* In memory of
The best word to use will depend on the specific situation and the tone you want to convey.