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The key is balancing personalization with reaching enough people. Nobody wants to feel like they're part of a mass email, so making it relevant to the reader dramatically matters. Tools like email finder linkedin can help build targeted lists of people who might be interested in what you’re offering. It’s worth exploring if you haven’t already.
Also, keeping emails short and clear works better, in my experience. People are busy, so something that gets to the point without feeling pushy feels more natural. Another thing that’s helped me is experimenting with subject lines.