Stop living in your bubble. There are smart people out there that you need to cross paths with in order to expand yourself. Reach out. Try cold calling or cold emailing someone you have an interest in. Explain why you’re sending an email. It’s not hard. What is there to lose? They don’t respond to your email?
If you are educated in the subject or know a bit about the person, they probably won’t just blow you off. They will probably reply with an awesome response. Even if it doesn’t expand your knowledge, it still gives you some confidence in doing it again. Once it becomes comfortable it won’t matter who you’re reaching out to. It could be an acquaintance or the CEO of Apple.
Realize the only downside of not reaching out is hurting you. There really isn’t a downside. But the upsides could be tremendous. Go for it!