A 30% reduction is astonishing and shows extreme dedication. A few things you might try are to increase your fasting time by completing your last meal at circa 18.00 - can you get a walk in after this meal? Another possibility is to do deficit training (I do this), which is to perform some exercise before breakfast (athletes do this).
You can afford to do HiT as this is just a series of exercises with no or minimal recovery e.g. you could walk as fast as you can for say a mile, get home and immediately perform 3 sets of 10 squats, 20 punches, 5-10 sit ups and 5 -10 press ups - this might be challenging at first but soon you will smash it, at which point you can you tube HiT / HiiT / Tabata for more advancement. The resistance in these exercises will burn more fat when you are resting and lean out your muscles, can't promise Tokyo but I am sure with your dedication improvements would be made.
