I don't know. Would I still be me, then? So at that point could I even still answer this question?
Well, if I could start this all over again as someone new, I'd want to be someone less curious about actually understanding the way the world works. Someone with more hunger and less depth. Could I "change into" another person, realistically? Possibly.
I feel a sense of grief imagining myself becoming someone new, the same way I feel a sense of grief imagining myself dying. It would take a lot of effort or very effective brainwashing, and I feel skeptical of myself being able to maintain that kind of state for long. Certainly not without much internal suffering.
For me, dying is as large an opportunity cost as becoming someone more ideal, from the perspective of what I imagine this world wants from me, ideally. It's just that dying is permanent and there will (hopefully) be no more suffering after it, whereas living lasts for probably several more decades and would involve much more suffering, while someone else inhabits my body.