I really like the ability to skip setup and go for sandbox presets with premium features paywalled - this seems like an obvious choice.
Most SaaS products like these require you to go through their complicated setup just to see what they are about.
Also, highly recommend "The Mom Test" by Rob Fitzpatrick - https://www.momtestbook.com.
It is so revealing, especially to people like me who naturally tend to think that just automation of processes is going to make something people want. This book is, by far, the best resource I found to get out of that mindset and learn how to get real feedback.