I was thinking I would post on both for a while and set a date for this npub to retire. That way I could hopefully most people who want to stay connected can have plenty of opportunities to follow the new npub. 

I'm putting a lot of effort into Nostr and it would suck to be forced to switch npubs suddenly because my keys were compromised. 

Thinking about changing my nym too in order further separate from my Twitter identity. Right now everything is totally linked. Want to add an extra layer of obfuscation while I'm at it.  

 I'd note on the new npub and boost that note from the old npub.

That way you're reminding people & sharing the content.