A lot of our customers use post purchase surveys and on-site surveys to help with this sort of thing. For example a really common use-case is an attribution survey which appears after a sale is made. The survey will ask something like "how did you hear about us?" which helps determine what actually drove the sale so they can get some clear insights outside of Google and Meta. It's not perfectly reliable but it's an additional data point that helps with the mess out there...
A lot of our customers use post purchase surveys and on-site surveys to help with this sort of thing. For example a really common use-case is an attribution survey which appears after a sale is made. The survey will ask something like "how did you hear about us?" which helps determine what actually drove the sale so they can get some clear insights outside of Google and Meta. It's not perfectly reliable but it's an additional data point that helps with the mess out there...
[1] https://www.zigpoll.com/