If you’re mostly reading fantasy fiction then you probably need to mix it up. Most activities are subject to habituation—do it too often, too frequently and its effects will diminsh.

Refresh your experience by diversifying. Non-fiction is an obvious choice, literary fiction would be more grounded in characters, or if you want a different take on the fantastic you may enjoy speculative fiction for being out-of-this-world yet having relevant topical subtext.

Be aware that commercial sci-fi and fantasy can often be heavily driven by world-building and thus thin on other qualities. Being highly selective of authors may help once you have changed your reading habits.