Just have kids. Whatever posttranshuman creature inherits the ghost of your body in a thousand years won’t be “you” in any sense beyond the pettiest interpretation of ego as “continuous memory”, and even that falls apart quickly under scrutiny.
Your offspring are as much “you” as that thousand year ego projection. Except they’re better, because they start a whole new fresh consciousness unfettered with your accumulated prejudices. I advocate we raise children better, wiser, and accept death younger and more usefully.
Or from the other angle—reason is a self defeating joke meant to point to it’s own ridiculousness. But what can we as Christians salvage from this wordly conceit? One might even say, this is how modern European philosophy began.