I made $1500 with TalkNotes by simply listing the app on various startup directories.
Process is simple: find directories, fill out forms, and pay if the site had a high domain authority.
Most traffic comes from these directories, but it's not sustainable in the long term.
I also collected valuable user feedback through automated welcome emails, which helped shape upcoming features.
Plans for September = releasing top-requested features, introducing a subscription model, and launching on ProductHunt.
Blog version: https://talknotes.io/blog/reached-1500-revenues