What should i do if my vitamin d level wont go up even with prescribed viyamin d tablets for 6 months?

Get some sun: Vitamin d supplement is best taken with food to aide with absorption. I hope that you have done that already. If you can, get sun exposure for 10-15 minutes between 10 am and 2 pm is another great way to get vitamin d for the body (if your doctor is okay with it). Remember that sunscreen will interfere with vitamin d formation on the skin.