How can I make my brother more masculine?

My brother is 15 and he used to be a normal kid but in the last two years he’s become a lot more feminine. He stopped playing soccer to spend more time writing. He’s more emotional. He even has a skincare routine now. In general, he acts like a girl now.

And I fear that people are gonna make fun of him or that girls won’t like him. My father doesn’t care about any of this and at school he doesn’t have good influences. So is my job to help him with this.
How can I make my brother more masculine?
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