The idea of free will is thorny. Even philosophers who work on it a great deal have a hard time figuring out what anyone means. This is my conclusion, after much thought: All events necessitate causes, therefore no event, including human action, can be self-caused. Quantum physics doesn't save free will. Randomness and unpredictability are just as constricting to human will.

The entire question is super fascinating. It's one of the last remaining delusions of humanity. Many otherwise thoughtful people are uncomfortable considering the question at all.