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.