Update (note, I’m on vacations for a few days, that together the bank holidays of new year means I could play a ton) :
I finished almost all the stuff of the initial area and the peninsula, including the dragon (being patient and going all the time around its back), the knight that is around at the beginning, and other stuff.
Later I finally decided to go to the Stormveil Castle. I needed a good amount of time to explore it fully (that included killing the grafted enemy near the kitchen), lots of places you can go jumping down from some points. It wasn’t that hard, all things considered, and the boss eat the dust on my second attempt.
I think that I just reached the castle a bit overleveled, as I have done all that could be done in the other areas, including the forest at the east, where I discovered the entrance to the Siofra river! I had no idea, it was a good surprise to have.
Looking at the map, I only explored 1/3 of that underground area, at that point I decided to continue on the surface as things were a bit too hard (although not impossible).
So now I explored a bit north of the Stormveil Castle (Lurnia of the Lakes) although I’m in between doing that area or Caelid first, not sure what is the ideal order. I guess I will have to try.
About weapons, I’m using an unlikely weapon: a freaking anchor. Yes, from all the weapons available, I decided to level up that one.
Although in two or three more levels I will be Strength 30, then I think I will change to some other weapon.
Armor wise, the game is a bit of letdown. I still can’t find anything good, and I don’t like how it cannot be upgraded when weapons can be.
edit: oh yeah, finally after the castle i could upgrade my currently used spirit, the demihuman squad. First to +2, that helped me with a few stragglers (ie. bosses I had pending to do), and now I got enough ingredients in the dungeon near the erdtree between Caelid and the initial area, so I just upgraded it to +5, now it should kick ass.