What does it mean to be immortal? We haven't solved key questions of personal identity yet. What is it for one personal identity to persist?

If you define yourself by the formal definition of a general intelligence then you're probably not going to go too far wrong.

That's what your theory ultimately entails. You are saying that you should go from specific labels ("I am a democrat") to more general labels (" I am a seeker of accurate world models") because it is easier to conform to a more general specification. The most general label would be a formal definition of what it means to think and act on an environment for the attainment of goals.

I don't think your theory is particularly useful.