Something resurgent comes back to life or is reinvigorated. An old song's popularity might be resurgent after it's featured on the soundtrack of a popular new movie.

When things fall out of favor or stop being active and then experience a burst of energy or interest, they're resurgent. After a period of very conservative political control, resurgent liberal beliefs could lead to a progressive president being elected. And if people get bored with new technology and gadgets, there may be a resurgent interest in hardcover books and Polaroid cameras. In Latin, resurgere means "rise again."

Definitions of resurgent
  1. adjective
    rising again as to new life and vigor
    resurgent nationalism”
    synonyms: renascent
    restored to consciousness or life or vigor
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