I've spend hundreds of cents on ads, so take this with salt, but is it futile to pick "the most important thing". A bit like is exercise more important, or die

I've spend hundreds of cents on ads, so take this with salt, but is it futile to pick "the most important thing". A bit like is exercise more important, or diet? Well if you are eating only lard and running every day, then diet is important for you, and if you are eating really healthily but sitting in a chair 14 hours a day, then doing more exercise is the impactful thing.