Today is going to be a very short topic, as I am supposed to talk about any UPG I may have on Apollon. Yet, as I have stated before, I do not really have any personal relationship with Him at all and have no UPG or personal revelation that He shared with me.
The only thing I can share is that, in my experience, Apollon doesn’t like Dragon’s Blood incense very much. I have tried it in the past when I first started out and used that incense for various Gods, but it always gave me trouble when burning, the sticks just wouldn’t stay lit for very long and I had to relight them several times. Maybe it was just a bad batch I got, but I also interpreted it as “We don’t like this incense” and thus stopped using it once I had used up all the sticks.
Of course, your experience might be different, and I do not recall if I ever offered it to Apollon specifically. It does seem like it might suit Him given the myth of the Slaying of the Drakon of Delphi, Python. So feel free to try it out for yourself and see what the results are.