Finishing your case is entirely dependent on your treatment and when you are released from care by the doctor(s). Your health and well-being should be your first priority. Therefore, you need to have reached maximum medical improvement before you settle your case. If your case goes to trial then past, present, and future medical issues will largely be determined by the opinions of your care provider(s).
If you’re going to consider settling your case your treatment should be completed so your doctor(s) can tell you you’re done treating and you’ve made a full recovery or you’re going to continue experiencing problems as a result of your accident.