I think probably nothing, at least, not in the US. But here is an interesting article about those who are trying and how they’re trying.
And how are they trying? With numbers. Lots of numbers.
I am skeptical that numbers are the answer. More data only sometimes helps. Sometimes more is more and not better. More junk is never helpful.
The problem, overall, is kind of interesting. What could help soccer? It’s a business question, a marketing question, a sports question, a data question, and a culture question. None of these topics is itself simple. Combined…as I wrote above, I don’t think anything can help soccer.