Acl and meniscus reconstructed. Strong.

Hello doctors, I had torn my acl and meniscus while playing football two years ago and I am a professional football player. I was diagnosed with acl and lateral meniscus grade 3 tear and I undergone acl and meniscus reconstruction and it was done in November 2019 and it's been 19months since then I don't know how and why but there is still instability. When I try to play i feel like if I put more pressure, I'll tumble and fall. Just consider if there is some water on the floor and if I slip suddenly, I may fall due to instability and this is occurring after having the reconstruction. I am unable to do rapid movement like the zig zag movement in football, I don't feel the complete confidence and have a fear I may fall if I put more pressure. I don't have any problem in any daily life activity, I can run but can't play sports perfectly. I did exercise for 3months after surgery. Any suggestions why is this instability occurring and how to avoid it and how to make my knee strong...