Sure, here are the sentences rewritten using comparative structures:

1. The more persuasively they communicate, the more people they influence.
2. The more regularly she practices mindfulness, the greater inner peace she experiences.
3. The more risks he takes, the higher the rewards he achieves.
4. The more challengers she takes on, the more she grows as an individual.
5. The earlier you start preparing for the exam, the more confident you will feel on the test day.