Sources for data to define use cases

I have a platform-type product, that can be used in a myriad of ways, there are some use cases defined, but they are compiled intuitively or from the company perspective rather than the customer (i.e. in terms of the implementation difficulty or product selection). Seems like there can be loads of ways to collect the use cases, based on different prospect/customer sales cycle stages (i.e. prospect gong call analysis vs classifying case study client use cases). What are the best ways to collect use cases, and how would you balance out the quant vs qual research as well as breadth of the audience (all prospects vs best-fit customers)?