I've got my Libreboot X200 Thinkpad running Trisquel 8... So now what?

The only person who can answer that is you. What do you think you can do with it? With GNU/Linux almost everything is possible. It's like the discovery of your vocation; the possibilities are boundless but only a few are the good ones for you.

Recently I questioned myself pretty much the same, and I found those stories, I liked them so much and help me to found what I wounder to do whith free software:

https://www.fsf.org/resources/testimonials

It makes my dumb TV Think™ freely!

I get an adapter with VGA and headphone jack on one end, and HDMI on
the other end.  This gets audio and video from my laptop to the TV.

Then, I install Kodi and whatever addons I want, like 3anime.

Then, I set it to black my laptop's screen when Kodi's on, and to not
go to sleep when my lid is closed.

I close the lid, ignore the laptop, and the family uses Kodi on the TV
with their phones after going to F-Droid and installing Kore.  I'm
looking for some old Wiimotes for me to use...

Kodi has its own login, so people can grab my laptop and switch to Kodi
from the lock screen.

At least, this is how it'd be if I still had Kodi installed.  I haven't
had to provide entertainment in a while, and I haven't had Kodi
installed since my boyfriend broke up with me.  I was on Trisquel 7 at
the time, using Guix for Kodi and other packages.

Also, what do you actually do on a day-to-day basis with electronics?

I do the typical stuff:
* Make phone calls
* Text with friends
* type emoji
* Check email
* Video chat
* Watch YouTube
* Print/scan documents
* watch movies
* listen to music
* look up the definitions of words
* play games
* chat
* shop online
* do taxes
* type in ancient Phoenician