I would recommend email outreach (for B2B SaaS) and content marketing for sure. Start producing valuable content for your target audience - it's a lonely place at first but with persistence & consistency you should start to see results. Good luck! 💪
For SaaS a key channel will be comparison website. You need to harvest some customer review on G2 & Capterra, as it will help you a lot on long run.
Beside this Quora can be a nice channel to get inbound traffic.
Outreaching influencers can also give you valuable feedback early stage and potentially build some affiliate network.
You can target:
- Linkedin influencers (the hashtag feed are automatically curated for influencers)
- Medium top writers
-Youtube influencers (you can get their email from their about page).
If you need some help, you can contact my agency: https://www.tetriz.io/