How to find internships at big companies or startups?

Hi everyone, I'm a high school junior currently studying in Canada. I'm hoping to do a short-term internship at local companies. And I'm planning to cold email some start-ups or stem related companies.

Does anyone know how to find local start-ups or potential companies to work with?

I'm not looking to email big companies like Google or Microsoft since the chance of getting a reply is probably really low. Any suggestions on this will be helpful and greatly appreciated <3

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