He's had issues with his vocal chords, so this is a potential reason why he hasn't given many (any?) public appearances as of late. Curious to follow, as I've wondered the same thing...
https://www.silicon.co.uk/workspace/google-larry-page-vocal-...
https://www.silicon.co.uk/workspace/google-larry-page-vocal-...
It's hard to see what else he can do that will match Alphabet. Talk about changing the world, he did it.