One thing I feel is a big contributor to burnout is being too focused on the "anti" aspect of left struggle. Being anti-capitalist, anti-racist, etc. Obviously, being those things is good, but defining yourself too heavily by being the antithesis of the status quo is an exhausting endeavor. Try to direct more energy to the post-capital restructuring, and anchor yourself on what you believe in as well. Universal access to material security, education, healthcare, etc. A better world is coming!