62k subscribers and I have never topped Product Hunt. My launches: one dedicated issue (story, not features), one week of in-product banners for existing users, and replies. I answer every reply for 72 hours. The replies ARE the launch.
Numbers from the last launch: 41% open, 9% click, 300 trials, 60% of annual plan uptake in week one. Total spend: zero. Total time: one week of writing plus three days of inbox.
Product Hunt is a spike. Newsletters are a slope. Spikes photograph well. Slopes pay rent. (No disrespect to hunters, spikes have their uses. But own your slope first.)