"Solving death" won’t help humanity. Isn’t that obvious to you??

For a starter, birth rates and death rates should be about the same otherwise it’s not sustainable. If you "solve death", birth rates will need to drop a lot.

Do you want to live in a world with almost no children? Just very old people all over the place. Sounds like a nightmare to me.

You need to let go, accept your mortality and leave some room for new humans to live. At some point you’ll have had your time, death is part of life.