It was back around 2018 that I was first learning the ropes in b2b sales, but I do think I felt similarly about people being able to detect parts of what I'd written that were copypasted, not lead-specific. So I just stopped copypasting stuff, wrote short nice genuine emails, opened up to the people that wrote back. Called the ones that didn't. Always hated phone calls beforehand, but some good experiences on a few early calls definitely eased my nervousness.
I remember the first time I had to call the director of a big competitor, he was like "What was that? I can't hear you, I'll have to put the top down. I'm joyriding in my [luxury sports car] right now". I found that extremely funny and it really broke the ice. And once I was able to be casual with him, I found it easy with pretty much everyone.