Holy mother of cringe.
>Lineage OS+other hacking
The fuck do you mean by other hacking
? Graphene OS is much more privacy friendly but reduces the functionality of your device. And if you use any popular sm/search engine, you're not going to achieve privacy. Especially if you've used jewgle. And stop using meme distros for linux. Gentoo is trash. Use qubes+whonix gateway if you're aiming for privacy, or arch with modified settings for normal usage.
>Self hosted website
If you used a home server/a server that is traceable back to you, there's no point in attempting for privacy, since all the info to dox you is available there.
>Self hosted email
I programmed the server myself, and it's hosted in a random african country using appropriate security measures. I won't spoonfeed you but there are plenty of resources on gitlab and r/selfhosted. You can use this website to test your email: https://www.mail-tester.com/
But all that being said, it's not necessary to do all this stuff. If you're unable to code your own script for an email server, you should probably use a readymade, 'secure' service.