How to switch from 1Password to iCloud Keychain

I’ve been a 1Password (1P) user since 2008. I have nearly 900 logins, passwords, and other secure iteams in 1P. I’ve trusted 1P since 2008 because the app used essentially the same Mac OS X (as it was then known) Keychain but allowed for greater functionality and web browser autofill. I thought I’d give Apple’s …