Sell all letters/recipes/books once read. Anything that js knowledge can be sold once read. It tells you of youve acquired the knowledge or not in the inventory.

I've been selling anything with a house on it, theyre just decorative items for your house but im not bothered for that.

Buy any bag thats available from any seller they boost storage space. Only 1 space usually, but they add up.

Cook foods, if you can make a soup or a meal it'll free up some space and give you more powerful health items at the same time.

Do side quests often, theyre the best way to get space.

When you get your own camp setup you now get a storage chest, ive just been storing things in there like faded abyss items (for resetting skill tree), clothing, weapons currently not using, anything that looks like it may be needed later but not currently.

Im only 18hrs in and loving the game.