Hi Bonnie:
Knowing our students is also a key to reingaging. Anticipating how students will respond or planning for the way a particular class receives instruction is invaluable.
Keeping interest involves including information the student finds important - that's where knowing your students really helps. Students will listen, pay attention, and get involved if they feel they will benefit from their effort, such as "it'll be on the test", or "you will use this information everyday in your work", etc.
Regards, Barry