Get feedback from the recently activated or recently churned users to identify what incentivised their actions.
Figure out the top reasons that cause churn and address them.
Experiment at a product level and see how this impacts the feedback you are receiving.
Me, personally, and my well-trained team will be running your interviews. I am the CEO of Growth Sandwich and the founder of Usertalks. I am a certified Product Manager with more than 10 years of experience. The last 5 years, I have had to chance to work with more than 100 companies just like yours and train more than 500 product marketers all over Europe.
All of these tools are great but they do something totally different. UsabilityHub, User Interviews and other similar tools focus more on UX and usability by bringing external testers. While that's really useful feedback, it's coming from people that are paid to evaluate your design and UX and they have to appetite to use or buy your product. Challenges like high churn rate or time-to-value cannot and should not be addressed with external testers' feedback.
We are certified Product managers that conduct user research for a living. We have developed a really effective method to extract feedback even from introverts that is tested to our clients and previous employers. UserTalks is just a fraction of what we already do for clients.
User research feedback and especially interviews is an art. You need to know what to ask and how to ask it, you need to lead the conversation but not manage or impact its outcome. It's really easy for someone that's not experienced to mess this task and give back wrong feedback that might end up becoming irreversible changes in your product that will cost you lot of money.
We will never ask you to give us personal details of your customers and we will thoroughly get all the necessary consents needed so that we are 100% on the legal and ethical side.