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The JBL Tune 520BT headphones are a wireless on-ear model that offers a Pure Bass sound experience with Bluetooth 5.3 connectivity and up to 57 hours of battery life. They are designed for comfort and convenience, featuring Voice Aware technology for hands-free calls and a user-friendly app for customization.

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The headphones are dropped and the button is stuck

The headphones are dropped and the button is stuck and sometimes the headphones turn on themselves
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There are a number of disassembly videos for JBL 500 series. They all start by removing the ear cushion. I would assume they are all similar so search for one using

disassemble JBL Tune 520BT headphone

You may be able to unstick it, or yo may have to replace the switch.

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