Personalization is only the first thing to consider in outreach. The next thing is authenticity. People are not always looking at the number of personal information that you know about them. Don't ask yourself, "how many information do I know about my prospect?". But instead, answer this question, "How much do I care about my prospect?".

People don't care how much you know until they know how much you care. - J. Maxwell

Use reciprocation to your advantage. Offer your prospect something valuable that might interest him to do a favor for you (e.g. give you a link). If you care about what he needs, he'll be more likely to give you what you want.