I have over 300 on 1Password, some with more than 5 different accounts from the same site like Google and Slack. I also lean heavily on the 1Password extensions

I have over 300 on 1Password, some with more than 5 different accounts from the same site like Google and Slack. I also lean heavily on the 1Password extensions to help on the retrieval part. It's incredibly insane but I manage it by adding a namespace postfix so it's easier to identify which when autocompleting login forms. For example, "Google (Personal), "Google (UMich)" etc.