Can consider using more than 1 email application. Or using Firefox’s containers and access your email service via web (opening the tabs to your email service only when needed).

If you want to prevent IP triangulation stuff, can consider stuff like Port Master or network namespace (if Linux). Idea is that you will run different email applications for different email accounts, and each application will pass through a different VPN tunnel.

Honestly like what others said, I would look towards email aliasing. I usually recommend email aliasing for any activity which you know it would be for a read-only email (ingress/incoming).

Egress/Outgoing is harder to recommend unless its extremely informal or its used to reply to bots.

This way its harder to triangulate your activities through email, as each account uses a unique email alias.

Surprised no one posted this link: https://awesome-privacy.xyz/security-tools/browser-extensions

Great resource btw, check out the website for other tools.

Use this tool to debloat your windows: https://github.com/builtbybel/privatezilla , also, I heard that setting your region as English (International) during installation comes with less bloat-ware installed?

Also, lookup tutorials on how to Dual Boot.