SDL2 Events how to avoid monolithic control statement?

I'm using SDL2 in my game engine and I'm trying to figure out how I can prevent having a monolithic control statement like this:

while (SDL_PollEvent(&event)) {
    switch (event.type) {
        case SDL_KEYDOWN:
            switch (event.key.keysym.sym) {
                case SDLK_w:
               // Move player forward
                // if debug mode move camera forward
                // if in menu navigate the ui
            }
            break;
        case SDL_QUIT:
            running = false;
            break;

    }
}

For the sake of readability and length I kept it short, but basically having a case for every key I might want to use say ~10 and each might do multiple different things depending on the state of the game plus the plethora of other events I feel like it'll spiral out of control and become a big blob of ugly/messy code.

Looking for any suggestions on what I could do to approach this problem or if there's any typical solutions.