Japan entered World War II with 3.5% of the world's industrial warmaking potential (as compared to 41.7% for the US and 10.2% for the UK), and, as has been pointed out on this forum, the Imperial Japanese Army was lacking in mechanization, armored forces capable of standing up to Western tanks, as well as artillery and logistics capabilities.
Suppose that Japan had entered World War II far more industrialized, with something like 10% of industrial warmaking capability, putting it in the same league as the UK, as well as serious reforms carried out to the army (perhaps Japan takes heavier losses in WWI or gets hammered in an earlier version of the Japanese-Soviet border war in Manchuria which leads to serious reforms). How well could Japan realistically have done?