Maybe I’m complaining too soon and you already planned to change it, but I think the text area on the forum is set by default right now. To me there is a lot of wasted space of the right that could be used to have wider text zones.
Since I can show an example, it will be more simple. From another website (Gamekut.com, French website) using the Discourse tech:
Thoughts? Also, thx for the dark theme! You already did a good job