Strong enthusiasm and commitment:
* Ardent: Having or expressing strong feelings of enthusiasm and passion.
* Fervent: Having or expressing great warmth or intensity of feeling.
* Passionate: Having, expressing, or characterized by strong emotions or beliefs.
* Eager: Having or showing a keen interest or desire.
* Enthusiastic: Having or showing great excitement and interest.
* Fired up: Filled with enthusiasm and energy.
* Riveted: Completely engrossed or captivated.
Dedication and persistence:
* Assiduous: Showing great care and perseverance.
* Diligent: Having or showing care and conscientiousness in one's work or duties.
* Persistent: Continuing firmly or obstinately in a course of action in spite of difficulty or opposition.
* Tenacious: Holding fast; not easily pulled away.
Strong belief and conviction:
* Fanatical: Filled with excessive enthusiasm or zeal, especially for a religion or political cause.
* Dogmatic: Inclined to lay down principles as undeniably true.
* Intransigent: Refusing to compromise or change one's mind.
Other synonyms:
* Vigorous: Full of energy and enthusiasm.
* Spirited: Full of energy and enthusiasm.
* Impassioned: Filled with strong emotions.
* Dedicated: Committed to a particular cause or activity.
The best synonym to use will depend on the specific context and the meaning you want to convey.