God I love this question. I ask the exact same thing at least twice a week. I use to have real depression over this issue. I have zero answers for you. Persona

God I love this question. I ask the exact same thing at least twice a week. I use to have real depression over this issue. I have zero answers for you. Personally, I learned to truly be ok with the answer "we don't know yet, but we're working toward it together". If you can somehow get to that point, you'll feel a little ease and maybe even a bit more connection with the rest of humanity. I don't feel like most of humanity cares or even thinks about this in any regular interval, but I do. Might sound lame, but I feel like the right thing to do is contribute to meaningful work (space travel, medicine, sustainable energy, <noble cause X>) and focus on immediate problems in those areas. People like you and I will never be around to see if humans collectively find good answers to these questions, but the same can be said about all the humans before us that got us to this point, and I'm truly thankful for what they built so far for us.