Super happy about my first paying customer for Sponsorgap before launching it officially.
What marketing did I do so far? Actually not much but this helped so far to get some attention:
I tweet constantly about the progress: https://twitter.com/toomaime/status/1280965260762140679?s=20
I answered one of Indiehackers twitter question - "What are you working on?"
Talking in communities like Makerlog and Wip.chat about it