autoamplificarse

To amplify itself, a technical/figurative verb for a process, signal, or effect that grows stronger through its own feedback: el pánico se autoamplifica en las redes sociales. Rare outside technical, scientific, or media-analysis writing.

• El miedo colectivo se autoamplifica en las redes sociales. — Collective fear amplifies itself on social media.
• La señal se autoamplifica dentro del circuito. — The signal amplifies itself within the circuit.
• El efecto se autoamplificó hasta hacerse incontrolable. — The effect self-amplified until it became uncontrollable.

Using autoamplificarse for a person boosting their own voice or reputation — that's better expressed with autobombearse or darse a conocer; this verb is about feedback loops in systems or effects.