I noticed a lot of people have different advice, and thank you for responding!
To clarify, the cardio exercises I did were without running, on the spot. Jumping jack, squat / jumped squat, sprawl etc .. This surely weakened my knee, I have trouble falling, and since then I have a very small pain on the side of the knee when I take support. That's why for the moment I slow down everything that is lower body, even doing squats without weight, I'm afraid of hurting myself..
With the advice I got, I'm thinking of going on a bike, I think it's something that strengthens the legs and gives power, without a violent shock.
Maybe continue sheathing next to anything that is stretching etc..
For those who told me to eat a lot of meat, the problem is that each person's body reacts differently and many have different opinions on this .. I think you have to know how to eat everything but in moderation! Too little or too much is not good !