I'll go a different route since I see the arbitrariness of everything, especially with the scope of time, but that scope is also what makes living until the end a more obvious choice.

We have been dead for billions of years. We have no memory of concept of time or ourselves beyond our lives. Similarly, we will be dead for billions of years, almost certainly with no sense of self or concept of time.

The tiny speck of time that is our human lives is so small it seems unimportant if not foolish to rush through it. If the default state for such a large percentage of time is no experience, any experience, even the ones that cause us to suffer, has such a novelty and quickness that surely you should just wait.

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I also like the song 'Any Major Dude' which is about just going to sleep because you'll feel differently the next day. If you look at things like suicide rates and coal fired stove availability in England[1], it's clear people rush to kill themselves who wouldn't have if they had to wait.

1:https://www.npr.org/templates/story/story.php?storyId=923193...