Ask HN (/Show HN?): Beta released, what next?

Hi all - long time lurker... First time posting.

I recently launched a private beta of my weekend project (easyretirementplanning.ca if you want to provide some feedback!), and now I'm unsure of what to do next.

The folks I've had try it out had positive reviews, and a number of suggestions that I can implement over the next little while. My question is what is next? How do I decide whether or not to take this to the next level?

As this is a financial services application, there are significant legal & regulatory hoops I will have to jump through prior to charging for the product. Not that I don't have the drive/interest to do so, I just don't want to put even more time behind something that may not take off.

I suppose in one sentence - "how do I determine from a private beta if I have anything even resembling product/market fit"?

Thanks!!