Signal is backdoored, so I'd remove that from the list if possible.

I use Protonmail for my email, so I'm fine with that.

NextCloud is not secure, so I'd use something else personally.

I don't use Cryptpad, but LibreOffice instead, since I like doing things not in the cloud for office shenanigans.

For GitHub-style things, I use Codeberg (based off of Forjego), but all the others I could see being used.