The answer depends on where you are in the funnel.

If you're pre-product-market-fit: don't think about channels yet. Talk to 20-30 of your ideal users directly. Reddit, LinkedIn DMs, cold email — use whatever gets you in the room fastest.

If you have early users and some validation: the three highest-ROI organic channels for a SaaS are:

1. Community-led growth — show up consistently in communities where your ICP already spends time. Answer questions. Share useful things. Don't pitch. This builds brand recall that compounds over time.

2. SEO + AEO — create content that directly answers the questions your buyers are typing (and now asking AI models). MasterPlan AI could own content around media planning, ad strategy, and performance marketing questions.

3. Strategic partnerships — find non-competing tools your target users already use. Cross-promotions, integrations, or co-created content can send highly qualified traffic fast.

The biggest mistake I see SaaS founders make: spreading across 5 channels and going shallow on all of them. Pick one or two, go deep, and measure weekly.

What does your ICP look like — and where are they spending time online right now?