[aantix]

Good old fashioned foot work. Cold email the places you know that use your tech stack.

Introduce yourself and what you have to offer. Show that you understand their business and some of the technical problems they may experience.

Ask for referrals after contracts complete.

Open source contributions and presenting at industry conferences go a long way to establishing an air of expertise; carry yourself like an expert and you almost always will get a second look from a potential client.