Build your script over multiple drafts
One of the best experiences of working with a script is living through its evolution. Despite facing writer’s block, sit with the script to fine-tune it over regular drafts. This will help you develop a compelling thriller

Build sequences with the director
This collaboration involves discussing the screenplay's themes, visual style, and character nuances, allowing the director to translate the writer's words into compelling visuals and performances on screen

When adapting a book, develop the film's universe
As opposed to a novel, a film is crafted with multifaceted audio and visual mediums. It will require the screenwriter to focus on the emotional arcs of the characters, building visual sequences and dropping internal thoughts of characters - as is common in books

Develop complex characters
Thriller movies often thrive on well-developed characters with hidden agendas, secrets, and personal conflicts. Create multi-dimensional protagonists and antagonists with distinct motivations, flaws, and vulnerabilities. The audience should care about and invest in these characters

Utilise location and setting
The setting and location can play a crucial role in enhancing the thriller's atmosphere. Choose settings that are visually interesting and add to the story's mood. Use creative geography to build suspenseful situations and obstacles for your characters