If you've been following this subreddit, you would've seen a number of posts on gene therapy or similar. So I would look into that if I were in the same position as you:

Medical Genetics: This is a specialized field that focuses on the diagnosis, treatment, and management of genetic diseases. Medical geneticists work with patients and families to identify genetic conditions and develop treatment plans, including gene therapy.

Oncology: Gene therapy is becoming an increasingly important tool in the treatment of cancer. As an oncologist, you would be involved in diagnosing and treating patients with cancer and could also be involved in clinical trials of gene therapy for cancer.

Immunology: Gene therapy is also being explored as a potential treatment for immune disorders such as primary immunodeficiency diseases. As an immunologist, you would be involved in the diagnosis and treatment of these conditions and could also be involved in the development and implementation of gene therapy for these diseases.

Hematology: Gene therapy is being investigated as a potential treatment for a variety of hematological disorders, including sickle cell disease and hemophilia. As a hematologist, you would be involved in the diagnosis and treatment of these conditions and could also be involved in the development and implementation of gene therapy for these diseases.

Neurology: Gene therapy is also being explored as a potential treatment for a variety of neurological disorders, including Parkinson's disease and spinal muscular atrophy. As a neurologist, you would be involved in the diagnosis and treatment of these conditions and could also be involved in the development and implementation of gene therapy for these diseases.