reperk

/ˈripərk/
verb
  1. To perk up again; to become lively, cheerful, or energetic after a period of being tired or down.
    • The team tried to reperk after losing the first game, but morale was low.
    • A cup of coffee helped him reperk before the long drive.
    • After a short nap, she began to reperk and feel ready for the evening.