Good to hear you are on the mend. Your original description of the injury was wicked.
Gently work the range of motion as much as you can bear (no load). You can lose ROM when you baby a joint for a long time, even if it's not in a cast or device.
It would be super if you can get into a warm pool (not hot), let yourself get warmed up, then work the ROM for a little while, all the time staying in the water. Stand in the shallow end or support yourself on the pool side and work the knee round slowly & gently. Right after, put a big ice pack all around the joint and get it really cold. Let it cold-soak for 15 or 20 minutes. The warm-cold combo will do it good and also make it feel better.
Warm pool, not regular ambient temperature.
But, if any of this causes pain, stop. This long after the injury, pain will be a signal you are asking the tissues to do something they're not ready for.