Audience is on Twitter/X ? Build in public and post regularly about your work. Audience is on facebook ? Targeted Ads may work for you Audience is a set of professionals ? Target forum or places they go
Disclaimer: I'm not an expert in marketing either :)
Maybe too abstract, so here is a piece of actionable advice:
99% of SEO is to publish interesting content for your target audience.
I'd consider another niche that you can reach with ads or that is more likely to be receptive to outbound.
a) help you build anything useful
b) craft a value prop that any customer would find compelling
c) help the users here give you any real advice.
1. Get really clear on your ICP first https://salesroads.com/tactics/icp-sales/
2. Be able to answer “why you” if your market is too generic you likely don’t have a strong story here. Why is this the most important thing to build right now for your customers and why are you uniquely suited to building it?
Talking to customers one at a time is hard to scale and it is easy to scale zero customers. This mostly makes solutions that scale attractive when starting out. Scaling when you have many customers is hard work. Harder work than talking to customers one at a time.
Good luck.