Approaching 40 and looking for a fantasy series with a deep world

I am approaching 40 years old and I always loved fantasy books, but did not really read much fantasy in the past 10 years. I am looking to get back with something "age appropriate" that would be suitable for a person of my age and fit some of my preferences. Let me elaborate on it:

• In terms of characters, I would appreciate complex and evolving characters that face difficult challenges and choices, as opposed to the classic "good knight" and "evil dark lord"-style characters
• In terms of the world, I really enjoy deeply developed worlds with rich histories, languages and lore, almost as if the world itself is the focus, not really the main characters and their story
• In terms of story, it is not really "that important" to me, I like to see it more as a vessel to get me immersed into the world. Ideally it would not be a "John saves the world by defeating the dark wizard" story. I don't enjoy politics nor romance much.
• In terms of setting, I like the "classic" high fantasy setting with swords and magic. I do not exactly know why, but any "guns" or "space fantasy" are a turn off for me.
• In terms of the mood, I really enjoy a dark atmosphere and cold environments

Of course the above is just a wishlist and I don't expect to find the perfect match, but hopefully it helps with the recommendation.

I am not sure how relevant it is, but to complete the picture, some of the fantasy series that I really enjoyed in the past when I was younger to much younger were mostly the mainstream classics - Tolkien's works, Harry Potter, The Witcher, A Song of Ice and Fire, each of them matching some, but not all of the characteristics above (e.g. Tolkien for the amazingly developed world, ASoIaF for the complex characters, The Witcher for the rather dark setting, etc.).

Thank you for all the recommendations!