Ah man… it’s not looking so good. The US fleet off Hawaii looks like it can take you, and in my experience that’s never a good position to be in for Japan. Unfortunately, you have fallen into the trap that is China. For future games, don’t go all in for China until you’ve taken Calcutta. It’s just a huge cesspit that devours Japanese ground units and does nothing to help you win. There are no victory cities there for you to grab, and because there is no capital China is the easiest Allied power to bring back into the game. Also as Japan you want to grab SOME, not necessary all, of the money islands the turn that you go to war. I prefer a J2 DOW and grab Borneo, Kwangtung, and Malaya, as I’m a firm believer of storming Calcutta as soon as you possibly can.
In your current position, I would finish off China since you’re already so deep and there’s very little Chinese units left. I would focus all of my ground efforts in southeast Asia with the ultimate aim of taking Calcutta, and going on the defensive in the Pacific. For me this would mean huddling everything I can into SZ6, with a full scramble waiting to go on Japan itself, and then basically waiting for the opportune moment to strike. You’re definitely in it for the long haul at this point, it may be too late to get the money islands. Good luck!