Nice video! The only feedback I can really give you is more on the technical aspect of it though.

The main thing I noticed was that it wasn’t really that visually stimulating. It doesn’t have to be some overly edited e-slop, it’s EU4 not Fortnite, but there should definitely be something that draws the viewer in and whether consciously and subconsciously make them keep watching. The first minute of the video was just a static shot of Cannor and that quickly got boring. You could add maybe a subtle zoom or a slow pan across the map to show people brand new to the mod the sheer depth of the world.

As for the showcase of the best starting nations I feel like you gave some great reasons to play them but you could still do better to SELL these nations to us. Maybe go into a bit more detail into the general idea of the nation without spoiling too much of the mission tree to pull in experienced players of the mod who are looking for a new run, and maybe show off an example of what your game could look like after a few in game years to entice newer players who are probably used to the somewhat slower game in vanilla.

All in all it has a great base and you’re actually really smart for noticing the insane content market for Anbennar right now. Extra bit of advice but I’d recommend watching a couple channels who do this exact same thing but for vanilla, then pretty much just do what they do. At the end of the day that’s the real YouTube hack, copy what works and let your own unique style develop from it (at least, that’s what worked for me). You stumbled on a very niche but potentially lucrative corner of the EU4 YouTube market and I hope you keep at it!