1, Workout, although there aren't exercises that directly strengthen your acl, mcl, lcl, pcl (although you can isolate your patellar tendon) if you strengthen all the muscles around it not only will the bone and muscles get stronger but it'll encourage all that good stuff to get stronger. It obviously takes alot of time and results aren't immediate but it will def help. You could go to a PT clinic and ask if they have any injury prevention programs.
I personally find trying to balance on a half ball to help ( I'm recovering from a tib fib break) and I feel more burning in the ligaments around my knee then I do in my calves and quads.
2, Don't crank your din up because of ego, you'll end up crushing your own ego after breaking/tearing something
3, I haven't used knee bindings nor know everything about them but from what I know investing in a good binding with good elastic travel can reduce torque on tib fib and knees. Aslong as the binding has 180 degree releasing (which most do).
4, Replace your bindings often (Every 5-7) years, I broke my leg pretty bad because I was using a 7 yr old binding which did seem to release fine until it didn't (If u wanna see I can link an x ray just lmk)
5, Try to stretch often, not only before you ski but try and become more flexible than you already are (I'm super stiff) but not to the point where you stress out your ligaments too much and possibly loosen tendons by prematurely pushing yourself (take it slow)