Treatment for an “ailment” is as variable as the possible roots for it. Nevertheless there are rather common causes and avenues of approach.
I will start by analyzing the structure of the plot alongside the main characters and their relations. My first recommendations are always personal: how I would solve this, were it my project. Often the problem has its roots many pages before it becomes visible in the script and structure. Sometimes the first pages of expositioon may lead your audience into the proverbial cul-de-sac. If this happens, it would be pointless to doctor the dialogues of the final 50 pages.