Did you have a Stripe account manager? If so, get them on the case – they know you and can advocate for the business and explain the product internally. At the very least they might be able to give you a much more detailed explanation of which precise features are causing issue and how you could resolve those things. If not, why? Payments are a core part of any SaaS business, and it's important to have trust with imp…
I don't. My MRR is $5 currently, peaked at around $40. I'm far too small for Stripe to care about me. I was running this as a passion project. I'm not sure how to even get an account manager (does it just happen if you become big enough to matter?)
The thing to remember is that Stripe (or your cloud provider, or your email sending provider, or any other SaaS) get something out of that relationship – they get a sales channel, they can trust you more, they can lock you into their services, they can show you more of their value – these sorts of companies basically want these relationships. The fact you can sign up with a credit card and never talk to anyone is sort of just to appease devs that don't want to talk to anyone, it's not how they make money in the B2B market (it's a bit different for B2C or B2B-ish services like Squarespace).
This project sounds pretty neat, and I could see it appealing to the audiophile market. I know people who would be interested.
But, I'm sorry to say, it sounds like Stripe cancelling your service wasn't the biggest issue, but that the service never found its market. Looking at the site I couldn't tell what it was or who it was for, and it looked a bit dodgy. Copy like "we're not google. we won't kill the site" (said twice) makes it sound like a hobby rather than a company, and even if that's true, it's not going to go over well for marketing. Also, it's sadly somewhat ironic given that the service has indeed gone. I totally see the vibe you were going for, but I think that vibe is one that typically maxes out at a handful of friends using it.