The stiffness is probably due to prolonged immobilisation. Your could try physiotherapist. If no improvement, you might need another minor surgery to free the joint ..

It is possible that your finger may not be moving as well as it did before the surgery due to the stiffness caused by the immobilization after the surgery. However, with proper rehabilitation, such as exercises and physical therapy, there is a good chance that you can regain full movement and function of your finger. It may take some time and effort, but working with a physical therapist or occupational therapist can be very helpful in restoring movement and strength to your finger. It is important to follow your doctor's and therapist's instructions carefully and to be patient with the process. If you are concerned about your progress or have any questions, it is best to speak with your doctor or therapist.

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Sorry but very very less chances for improvment

Hello Get an recent xray to check it was united or not..if united try physiotherapy exercises regularly... The stiffness is might be due to prolonged immobilisation

You have long standing stiffness post surgery done two times for your finger.. This is the cause of stiff.. Your finger stiffness can get better and you can get some range but whether it can be like before can be said only after proper clinical examination