Your analytics tells you a confident story about where leads come from, and the story is incomplete in a way that quietly misdirects your budget. Software-based attribution can only track what it can see, clicks, tags, referrers, and a meaningful share of B2B influence happens in places it cannot see at all.
Just ask
The fix is almost embarrassingly simple and almost nobody does it consistently. Ask the buyer how they heard about you, at the form or on the discovery call, while the answer is fresh, not in a post-purchase survey three months later when the memory has gone. A single free-text or short-list field, 'How did you hear about us?', captures the human truth that no tag can. The answers will surprise you, and they will frequently contradict your analytics, because the buyer remembers the podcast even when your software remembers the Google click.
This is how a founder discovers that a podcast appearance invisible to every analytics tool is the real origin of a large slice of qualified leads, and then does the obvious thing: more podcasts. Without the question, that channel stays invisible, underfunded, and undervalued, while the tracked channels that merely caught the last click get all the credit and all the budget.
Combine the two pictures
The goal is not to abandon software attribution, it is to stop trusting it alone. Software attribution is good at what touched the visitor on their way to converting, the mechanical last and assisting clicks. Self-reported attribution is good at what actually moved them, the influence that started the journey. Run both, and read them together. Where they agree, you have confidence. Where they disagree, the self-reported answer usually points at the real driver, and the gap between the two pictures is precisely where your most undervalued channel is hiding. That gap is one of the most useful things a lean operator can know, because it is where the next pound of marketing spend is most underpriced.