When the result of Istikhara is "no" or "not good", when is it permissible to repeat the Istikhara prayer for…

Answer

In the name of Allah, it is not permissible for you to do so. You sought the counsel of the Knower of the unseen in an action, and He prevented you. Therefore, it is not permissible for you to reconsider and attempt to seek permission for the action from which He has prevented you. Allah is the Guide.