First time building a B2B SaaS. How would you grow it with zero budget?

I run a SEO and content marketing company so digital marketing isn’t new to me. But this is my first B2B SaaS and honestly it feels like a different sport.

Problem is I can’t really put budget behind this new brand right now. Agency pays for itself, SaaS has to grow scrappy.

So right now, we’re strictly leaning on content (Medium, Website blog), LinkedIn/Reddit engagement, long-term SEO, YouTube experiments, and cold outreach. No paid ads at all.

Plan is to get to real traction first, then think about a small pre-seed once KPIs make sense.

Is there anything else you’d recommend to speed up the process and hit those KPIs faster?