Throw it in the bin and buy a new one. They are 2 for $6.50 on Amazon.
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Edit: added Amazon link
Google Shopping says there's one in Chula Vista
You can order on Amazon with 10a-3pm delivery
If you are still stuck DM me your address and I will send you one with Amazon prime. It will be this generic one tho: https://smile.amazon.com/TUSITA-Forerunner-Approach-Vivoactive-Vivosport/dp/B07512DV9Z
i bought a charging dock from amazon, hope it can help you