SDR’s and AE’s sometimes feel that if they reached out to someone a number of times and do not get any response, they move on. My philosophy is always follow up in a professional manner until you get a response one way or another. You don’t really know what’s happening on the other end, and many times they will get back to you wanting to talk, and apologizing for not being able to respond. It can’t hurt. What’s the worst that can happen really?