I had experienced a severe injury to my left knee a few years ago similar to your injury except it was both to the LCL and MCL with acute swelling and diminished mobility do to sharp pain. Not torn severally fortunately. No longer able to ride my bike or horses or practice martial arts for over a year, and I hobbled around at work. But I was determined to heal my self, and now I'm able to normally use my knees again as before the injury.
My protocol was simple but required well over a year of daily care.
1- After an extensive rest period I began stretching my knee ligaments, starting off vary mildely for months untill I was able to tolerate fuller stretches. A chiropractor will offer sound advice on how to stretch, or at least look up knee stretches on line.But never reaching the discomfort level at first when stretching. I consider this to be vary important, and try to developer the ability to stretch beyond what was the normal range of motion. Yoga may be helpful.
2- Daily massage around the knee as often as you can to encourage blood flow to the area.
3- Acupuncture may be helpful. I have a TCM background so I practiced on my self, reducing the sever swelling. But do not try this your self, get professional help.
4- Warm Epsom salt compresses to reduce pain and inflammation.
5- Once my knee had the range of movement that took me close to a year, I then began to slowly rebuild the muscle mass in my leg with simple sustained bends, vary mild exercises at first, then working up to squats. Always mindful of my limits and only increasing weight bearing with time. But always maintaining a daily routine . Naturally ones age and physical strength will determine the time required for recovery. In addition it is advisable to continue with the exercises for both knees after recovery to prevent a relapse.
6- I used infra/far infra lights. A electro magnetic pulser. And a Teams machine a few times per week.
The advice the other members have offered is in addition sound advice that I was also mindful of.
But the best advice I may offer is to have a strong determination to heal oneself, the mind is the most effective healer that can guide all other protocols. I know this to be true because I have done so my whole life, and this will can be used to heal others, and animals as well, for starters.
We all have this ability, if connected! And practice improves proficiency.
Now, I am somewhat reluctant to offer any healing advice openly, but gladly describe what has worked for me, that others may think about and understand.
The vary best of luck.
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