I run a productized service (design as a service) called Manypixels.co (https://www.manypixels.co) -- I got to $10K MRR by doing only two things:

1. Reaching out on niche Facebook groups to my target market (in my case: Entrepreneurs). I would simply say something along the line "Hey guys, I built this. Do you see value in this? Yes/No -- Why not?")

2. Creating content on Reddit / Indie Hackers about how we got to $10k MRR and being transparent about my learnings.

In the future I plan to do : 1/ More direct sales (via Angel list for example) 2/ Content on more marketplaces (Medium / Bootstrapped.fm / ...) 3/ Referrals 4/ ??? (open to suggestions here) :)