There are some older threads on killing the KJF.
Main items are:
Build AC’s to load with existing FIGs
Consolidate your fleet for defense.
Have a few SUBs for fodder and attack
Have at least 1 BB (preferably 2) to absorb hits and provide punch
You need to be sure you are killing the Pearl Fleet on J1, and whatever units UK sent to sink your TRN off Kwang in UK1
Then start with a TRN build off Japan in J1 (protected by a BB) and you can definitely offload 6 divisions to Asia on J2 (and 2 on J1).
Then, if the US keeps coming, build an AC and a SUB, and 2 INF (or more land units if you ahve the funds) to keep offloading to Asia
If US is still building up, another AC, and more land units.
If the US is building SUBs, be sure there is at least 1 DST in the fleet.
Then wait for him to come to you…
while you are sending 6 divisions per turn into Asia to boost your income.
That is the short version. It may need tweeked for specific strats (India IC, Sinkiang IC, etc.)