We launched on Product Hunt on January 27 (https://www.producthunt.com/posts/soundwise-2) and became #1 product of the day.
Things we did that seemed to work:
launched and drove engagement early. We launched a little after midnight pacific time. We contacted some PH users and some of our own users before launch day, and asked them to engage with our PH page early once launched. Early engagement seems very important.
several emails to our potential user email list. We have an email list of around 25k potential users. We emailed them a few days before the launch and also early on the launch day, encouraging people to post questions and give their thoughts about the product.
hosted webinar. We decided to host a webinar to drive buzz for the PH launch (it was scheduled 2 days after the launch). We promoted the webinar to our email lists, to our creator community (Soundwise Creators Lab slack group), and to our existing users. It also gave us something to talk about in the PH related emails, rather than just asking people for an upvote.
asked existing users to share their experience. We asked our existing users, who are audio creators, to share their experience and opinion about the product on our PH page. This drove much engagement because users also see it as an opportunity to gain exposure for their own audio products. Many of them posted thoughts about Soundwise on our PH page, as well as links to their own audio product catalogs on Soundwise.