The lesson
Quote a line from the recipient's own writing, say you're stuck on one part, and ask permission before asking the question.
Subject "About your cold outreach tip", sent to Cathy at Woodpecker. Nick quotes her advice that influencers get tons of emails and need more than "I'm reading your blog. Great stuff." Then: "there's one thing that got me a bit puzzled. Do you mind if I send you a question?" He adds he could quote her in an article.
Don't reuse "I'm trying to figure out some outreach tricks" or fake a puzzle you don't have. Keep the quote of their exact words, a permission-sized ask and a stated payoff for them.