Why not start by switching to open source solutions for some of your software? For example, Thunderbird works fine everywhere. It might not be as pretty as Appl

Why not start by switching to open source solutions for some of your software? For example, Thunderbird works fine everywhere. It might not be as pretty as Apple software but personally I've never had any major issue with it (used it on Linux, Windows and macOS). Once you've switched several of your applications and workflow to open source it will make it easier to switch everything later to Linux or Windows.