I'm also in similar journey to switch although still early. I started using Element in small circle and it works great.
For phones, you might want to check Jolla, its EU/Finish Linux phone.

And for the rest, being a open-source dev myself, I can only suggest open-source digital products:
For design work, see https://penpot.app/ its awesome and mature product.
If you need to publish videos, check https://joinpeertube.org/

You can find much more EU-based and produced digital services here: https://european-alternatives.eu/

Good luck!