How I got 200+ beta sign ups in the first two days of my launch

Hi everybody Shayan here! I just released the early access version of my app https://www.solfej.io/.

So far I've collected 150 emails and counting! This is my first launch ever, and needless to say I'm so excited :)

Here's some things I did to get more sign ups (from most ROI to least):

• Posted on niche subreddits. I posted on r/musictheory and some other niche subreddits. The thing with niche subreddits is that you usually don't need a lot of upvotes to gain traction. I was on the front page of r/musictheory with 5 upvotes!

• Launched on ProductHunt. I missed the front page by 4-5 upvotes (next time I need to apply super early) however I still got a good chunk of traffic. I highly suggest having your network (linkedin, friends, etc) come check out your post to gain those initial upvotes.

• Posted on my personal/music Instagram (2600 followers) an engaging story on my story (no pun intended) about my journey so far with the last story being to convert to checkout Solfej

• Found people in my niche on Instagram and made some cold calls to them from the Solfej account (surprisingly worked well!)

• Posted on sideprojects.net, submitted to betalist, betapage

Bonus item that I technically did before launch:

• I interviewed 10 potential users and based all of my website's copy on their issues they have with the problem I'm trying to solve. I have no quantifiable way of measuring this but I'm certain it helped!