Google Notes: Hosted Obsidian is AMAZING! You can self host for free, but I recommend supporting them.
1Password: I use Bitwarden (personal) and Keeper (work). Both, in my opinion, much better than 1Pass.
WhatsApp: this one is hard, as it has to do with your contacts. I'm in the same boat here. I use Signal for most friends, but my foreign friends use WhatsApp, which means that I do too.
I use pretty much the same stack except I use Standard Notes over Obsidian. Obsidian I will agree has more polish, but Standard Notes is open source and undergoes 3rd party security audits every couple years. I'm okay with things being rough around the edges if a project aligns with my own principals.
I'm not familiar with Standard Notes, but I like what I'm reading about them so far. E2ee is super important and is a bit annoying that I have to encrypt my Obsidian md notes folder. That said, the fact that the notes are standard md is super nice. I may try Standard Notes. Thanks!