Neural Charge workouts to avoid "burning out." Come up with a few different NC workouts and cycle through them, being sure not to repeat the same one for a few workouts. I'd come up with some that emphasize the whole body and some that emphasize specific movement patterns or muscle groups and use them as you see fit.
Sled work to increase overall volume and work capacity/caloric burn. You can make one if you don't have access to one....there's a ton of dudes on here that have made their own. I think a tire and rope/chain has been a popular choice for doing it outside.
I prefer more sled work (everyday or as much as you can tolerate according to where you are in your cut), to doing any sort of HIT sessions. A lot easier on the body, increases recovery and if you build the volume up over time, you end up doing more overall work than a couple of HIT sessions per week.