Behavioral Activation-Led Activity Engagement for Cancer Empowerment

The goal of this study is to learn if behavioral activation can improve daily quality of life for patients with advanced cancer. The main questions it aims to answer are: * Can behavioral activation be adapted to help patients living with advanced cancer optimize their daily quality of life? * Can behavioral activation be delivered primarily via smartphone? Participants will: * Complete a demographic questionnaire at the beginning of the study and quality-of-life and activity questionnaires at the beginning, midpoint, and end of study. Complete nightly surveys about daily quality of life, mood, activities, and experiences. * Wear a Fitbit activity tracker for 8 weeks. * After the first four weeks, they will complete a session with a member of our team about their day-to-day activities, behaviors, and experiences. They will select at least 4 activities/behaviors to increase over the next portion of the study. * Incorporate personalized meaningful activities into daily life * At the end of approximately eight weeks, (four weeks after the session with a study team member), they will complete a semi-structured interview.