I think that at least for B2B it's key to have someone among your founding team who either is/was a potential customer (e.g. has worked for some years in the ro

I think that at least for B2B it's key to have someone among your founding team who either is/was a potential customer (e.g. has worked for some years in the role&industry who would be buying this) or personally knows a few such customers (e.g. because they have worked in a different role but in the same industry, or in a similar role in a different industry). If you don't have that, you can "import" that knowledge but that will take a lot of effort and time, and you risk making some very wrong assumptions early on. And IMHO there are no shortcuts, to understand your market you have to walk a mile in their shoes, and if you haven't already done so before starting the startup, doing that will take out a big chunk of your runway. So it's not about some specific activities, but about choosing a project that fits your team or a getting together a team that fits your project.