Tibia fracture. Putting complete weight.

I meet an accident on 21st oct  and had compound fracture distal 1/3rd tibia and fibula. I went through open reduction and internal fixation on 22nd oct. During procedure, fibula was plated and screew was used to fix tibia. After 9 weeks my wound did not heal and skin condition become worse and was suggested to do skin grafting and remove the 2 screew from tibia which was performed on 15th December 2018. On 18th Jan 2019, I was put on ptb cast and asked to put full weight and walk with that help of single crutch or double which I was doing. After 6 week of ptb, x-ray was taken but I was suggested to be cast for 6 more weeks as there was not much progress in Union of fractured tibia though callus formation was ok.. I would like to know what other option have now or after 6 weeks. I have no problem walking with single crutch and I am putting complete weight.