Measures
At first, it can be hard to know if what you're experiencing is indeed burnout. As a first step, you could complete a self-report measure such as The Copenhagen Burnout Inventory (CBI), which is widely available for free online.
The Maslach Burnout Inventory (MBI) is the leading measure for burnout, available to purchase here: https://www.mindgarden.com/content/34-burnout-solutions
The Areas of Worklife Survey (AWS), available as a companion to the MBI, measures specific aspects of the work environment which may be contributing to burnout. There are different versions available for medical personnel, human services workers, and educators.
If you are on the Autistic Spectrum you may also wish to complete the Autistic Burnout Construct (ABO), available here: https://embrace-autism.com/autistic-burnout-construct/