Resurgence (noun)

1. A renewal of activity, popularity, or strength.
2. A resurgence in popularity or strength.

Origin:

From re- ("again") + surge ("to rise, flow or move forward suddenly or forcibl.y")

Examples:

1. The company's resurgence under new management was remarkable.
2. The resurgence of interest in classical music is encouraging.
3. The political party has seen a resurgence in recent years.
4. The resurgence of the virus is a cause for concern.
5. The resurgence of the economy after the pandemic is a positive sign.