> I worry about the long term existential risks to humanity with respect to losing agency, reasoning ability, humanness and creativity

You are going to be dead long before this happens.

You've probably got around 2350 weeks left to live (give or take) if you are very lucky.

Do you really want to spend them worrying about something that you have very little personal control over?

Figure out what you do want to do with your time and do that. The time is going to pass anyway.