1.) Imposition of a convoy system early in the war could result in safer military passage for troops, equipment, supplies, and could have sustained Japan's industrial ability for a longer period of time.
2.) Offensive use of submarines against American transport, and supplies would have a great impact. For jsut as Japan has to bring in every single bullet, and grain of rice to some far off island America has to do the same.
3.) Construction of a series of defenses to allow defense in depth. Japan for whatever reason went about the idea of creating strong defenses at the end of supply routes, and little to none closer to home. A reverse of this could allow the Japanese a stronger defensive position throughout the war, instea dof the Americans making a strong breakthrough and funneling through it.
4.) Limits on over expansion to save the combined fleet to be used to defend Japanese waters from the allied fleet, instea dof going out to seek battle.
5.) Earlier use of suicide planes to counter ships, and offenseive actions.
6.) Stronger army involvment in the Pacific to allow more defenses in key regions. This is not a call for the millions of troops in China to pack up and go home it is simply having a 100,000 or so more to throw agaisnt the Americans in key positions.
7.) Pulling out the most experinces pilots to train new ones. Japan could shorten its pilot training time, but in truth this is why they are such good pilots even when going up agaisnt the best the US had.
8.) No victory disease, but that is almost impossible to overcome.
The above is not outside of the ability of Japan, and in fact plays on fact of that with time they can have a more successful chance for peace with conditions. If Russia invades just as Americans are looking to the Soviets with contempt, then Japan may not seem so evil.