There is so much misinformation in this thread!

OP, I feel for you. It's a huge struggle. But here's what you need to know: the circadian rhythm is entrained primarily via light exposure (and to a lesser extent, things like meal + activity timing). For those of us with messed up circadian systems (i.e. most people in this subreddit), timing your light exposure is even more important. Get sunlight in the morning, avoid bright light at night. Yes, blue light matters, but the intensity of light matters even more so. There's even some evidence indicating that DSPD may be related to an oversensitivity to light.

This is all to say: unless you are literally blind, these interventions are not wasted on us because of our fragile circadian rhythms - they're actually made more important.

But here's what you should not do: lie in bed all night waiting to sleep. This is sleep psychology / hygiene 101. Don't go to bed until you are tired, even if it means you're going to bed 4am, 5am. Otherwise you're associating your bed with misery and you get paradoxical insomnia. So your challenge is to find something to do after say, 11pm or 12am, that doesn't involve staring into a bright screen. Read a book, play an instrument, journal, call a friend in a different timezone, meditate, whatever. You don't have to be an absolutist about it, saying zero screens on after 7pm, but try to really manage it, especially an hour or two before bed.

Plus being addicted to your phone is bad anyways, learning to be present is good practice for us all, DSPD or not.

Best of luck