One test: can you say what a lead costs from each channel, this month, from data — not vibes? If yes, you know exactly what's working. If no, the first marketing job isn't more marketing, it's measurement.
The minimum viable setup is smaller than people fear: analytics installed, conversions defined as real hand-raises, links tagged with UTMs, and every lead stamped with its source at the moment it arrives. A weekend of setup ends years of guessing.
Then judge channels on their own clocks (ads in weeks, SEO in months) against one shared ruler: cost per lead versus your break-even. Everything else in reporting is commentary.