I found Vampire Survivors in Steam's "Discovery Queue".
I didn't buy it at first but it was recommended in one of the "Since you like X" carousels and it was so cheap that I didn't really care if it was bad.
I've found a fair few games through the Steam store that I've really enjoyed. Two off the top of my head:
- "Gunfire reborn" is a fun rogue-like shooter from a chinese developer.
- "Risk of Rain 2", another roguelike. I'd played the original 2d version and didn't particularly enjoy it. The 3D sequel was great.
As per your example: how did we learn about Vampire Survivors? From neogaf or kotaku or some eceleb video. Someone is doing the curation for us.