Is MySQL better for future scalability of my social website I'm developing, or would MongoDB be more suitable?

The content will mainly be read-heavy and unstructured data like images, videos, and audio, but the relationships between them are somewhat complex (currently using MySQL in alpha stage); I intend to keep my platform in between Facebook and OnlyFans in terms of complexity.

Stick With MySQL In Beta
Transition to MongoDB
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Is MySQL better for future scalability of my social website I'm developing, or would MongoDB be more suitable?
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