> all technical challenges has been solved
That's a broad claim.
> we're focusing on building instead of scaling
if you're still building, are you not running in to any challenges at all? Not even 'hrm... this could be refactored so that we can reuse XYZ in multiple areas'?
> I feel that I'm not growing as a software developer.
How many tests do you have? What is your documentation like? What is the onboarding experience of bringing someone new in to the project? Do you have any sort of metrics/logging/observability instrumentation in place?
All of these are, imo, at least as important, but possibly moreso, than just "the software works".
