I have both a X-Pro 3 and a X-T30 for street photography and both shoot much, much superior pictures than any smartphone is capable of...
APS-C is still pretty relevant, your old DSLR might not be up to par to latest smartphone cameras though. And the image processing done by smartphones using AI tend to create weird and ugly artefacts depending on conditions, that doesn't happen with my mirrorless cameras, for example.
Have you tried printing smartphone pictures and compare them to your DSLR shots?