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A google Keep alternative where I can share certain notes with someone and have live collaboration on them.
Have you looked into nextcloud? It has live collaboration but I'm not certain if it has a Google keep esque format (they have most of the other gsuite apps on it as far as I know though). You'll just have to host it yourself but that's a pro not a con imo
have you found an alternative or work-around for Keep or Tasks?
You can self host Joplin or Trilium.
cryptpad
Joplin online could be an alternative. I self host it for myself only so don't bother with setting up a full Joplin server, the built in sync to synching works great.
Both official server with a monthly fee and self hosted server available AFAIK.