My advice is to start from where you are right now. Are you stressed out? Then try and calm yourself a bit. What good could you do right now for someone else

My advice is to start from where you are right now. Are you stressed out? Then try and calm yourself a bit. What good could you do right now for someone else of for the world? Now go do it. How did it turn out? Reflect, and make note of what you'd do differently next time. Repeat. Fancy philosophical musings can be a huge waste of time if they don't help you perform the steps above. It doesn't matter if we have free will or not, or if we live in a simulation, or if all of life is a dream or any of that bullshit.