Have you seen results with paid experiments at this early stage? One thing we are considering is to do a paid masterclass (low ticket) and run paid ads for that. Bring them in the funnel and get them signed up to use the product.
>>amanch+(OP)
Without knowing what the vertical is, hard to say whether a masterclass like that would provide good results. I know for some verticals things like free webinars etc can provide decent results, but that's usually b2b
So, usually paid experiments won't really give you a return at an early stage, but occasionally they can if you get lucky, but at least they'll give you an idea of what your CAC can be, and give you a starting point to start optimising it