It's a rough feeling for sure, I feel for you. I went through a similar phase for a couple of years adding features that weren't really necessary to software th

It's a rough feeling for sure, I feel for you. I went through a similar phase for a couple of years adding features that weren't really necessary to software that ran in the background at a handful of customers that already did more or less everything it needed to. How big is the engineering department at your company? Can you try to focus more of your efforts on tooling or building out useful libraries for the other devs? In some sense this is even less impactful than the actual software, because your actual customers will care even less about this than new features, but at least you'd have the other devs as your users who might actually appreciate your work. It could be things like improving the build/deploy pipeline, any monitoring systems, developer documentation, writing libraries/frameworks that simplify common internal patterns, etc.