Lock the door behind you
The 2nd Law of Thermodynamics, relating to Entropy, leads to the idea of the eventual heat death of the Universe, when all the heat is evenly distributed everywhere. Science will stop. Everything will be zeroized. It may happen a long time from now, but we now know that the Universe is not eternal. It will end. It will all die with no trace left. If your spirit, or disembodied mass of EM energy is eternal, you will need to leave this Universe sometime in the far future. If you don’t, and stay, you will become zeroized like the rest of the Universe, evenly distributed with everything else into nothingness without value. When you leave, lock the door behind you. Hopefully you can bring a rich trove of knowledge to the next Universe. If not, then all the work that was ever done will be for nothing. In that light, material possessions are meaningless in the long term. I can sell all my stuff for money to buy newer stuff. All that matters is what I carry forward inside. My experience in the now is what matters. I could lose everything and rebuild. The past is dead, and the future is everywhere at once until it collapses into the now. I am an experience. I am not flesh. I am not energy. I am a concept, a natural pattern with no 3 dimensional form. When you think about all of this, it makes your current problems seem pretty silly. They only matter right now. Now is your experience. This breath. This heartbeat. Death and Life. Pain and Pleasure. Everything we thought we knew. All we have are flimsy mental models of what we think of as reality. We are children, playing in the mud. We don’t even count as a civilization in the grand scope of things. As was said by project 2501 in “Ghost in the Shell”,”man is an individual only because of his intangible memory. And memory cannot be defined, but it defines mankind.” But even if you lose all of your memories, you will still be representation of a pattern as immutable as the number 42. You are an experience. Have fun.