I was in the same situation as you at my previous job, feeling like I wasn’t learning anything because I was working on a legacy system where every design and business decision made was pure insanity

After five years at this place I finally got my shit together and applied for a job

I spent the job interview asking pointed questions about their infrastructure and how they ran their business and then I contrasted their way of doing things with my old job and explained why their way was so much better

Turns out I was learning! And learning how NOT to do things carries some value