The saxophone is an imperfect instrument, especially the tenor and soprano, as far as intonation goes. The challenge is to sing on an imperfect instrument that is outside of your body.
I just try to do as good job with the material as I can and play some jazz as well, some improvised music, and do that every night. Just see where it goes.
It's a sort of bloom on a woman. If you have it, you don't need to have anything else; and if you don't have it, it doesn't much matter what else you have.