I'm a bit late but you and I think the same way-- getting a 1st person mod was the first thing I did.

I used (https://www.nexusmods.com/valheim/mods/44) and have found it to be near-perfect. FOV and other settings can be set through a config file.

It's made the game about 1000x times more immersive and actually quite frightening at times. Combined with the phenomenal scenery, lighting, weather, and ocean systems, it's just beautiful. Legitimately one of the prettiest exploration games I have played, but in it's own stylized, artistic way as opposed to true 100% realism (which I'm tired of at this point anyway).

But, there are a couple downsides. The game was never designed for this, so at higher FOVs you are going to experience some occasional clipping when straight down at your body. Still, I play at 100 or 110, which is quite high, and it's never taken me out of immersion.

The only other bug I've found is that, for some reason, if you are seated on a ship anywhere but the driver's seat, then the boat can jitter a bit when you look around. This only happens if you turn more than about... oh 30 degrees left or right. It's a bit annoying, but really was a non-issue for me, and holding onto the mast in 1st person while traversing a wild ocean storm really gives you a sense of true adventure.

There are other options, too-- ValheimPlus is probably the most popular mod and comes with a whole suite of upgrades you can turn on and off individually. I didn't realize it came ready with 1st person camera options and, since I had a working camera mod already, I haven't bothered to test how good their 1st person plugin is.

Let me know if you want help setting up the mods/mod managers-- it's not hard, but I did end up having to use something called "thunderstore mod manager" in combination with manually installed mods from nexus (which are just drag and drop plugins).

Hope that actually helps you!