Yeah switching to a #linux based system is a huge improvement if talking about #privacy. Today most of the software is easily accessible on Linux and works great. Even if there's no dedicated #linux version there are still something like Wine or awesome free and open source alternatives. I can recommend #debian and #popos.

For messaging apps I love #signalmessenger and I can also recommend Session.

For browser as well as a search engine I'd pick Brave.
Librewolf is also great