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.