Hi, so sorry to hear that your first application was refused.If it's been refused, I believe your second application will get refused as well if there are no changes to your situation and documents.
The second application is primarily for those who have not had their decision on the first application. So in my opinion, it is better for you to withdraw your second application cz it will save you $100 and reapply again when the situation changes or you have stronger documents.
By the way, why was your visa refused? Can you share the details about your first application! It will be helpful for others reading this thread.
Thanks.