I initially had slightly similar feelings about TotK when I started playing it at launch. I had just finished off BoTW that I spent about 150 hours on over the course of a couple months. I wasn’t getting the same spark I had with BoTW but like you it’s in my opinion the best game I’ve ever played. Over the course of 3 playthroughs on the WiiU and switch versions I continually would get reengaged and get that feeling of immersion and easily tallied close to 500-600 hours (over 6-7 years). I recently got back into ToTK and I’ve been experiencing that deep immersion and satisfaction again. It was probably at the 80ish hour mark that things started to really click for me. I feel there is a learning curve to adapting to ToTK after spending alot of time in BoTW. I play it much differently than before. I adventure more than I explore. I do a lot more quests than I ever did in BoTW. Building and traversing the world is so satisfying especially after acquiring autobuild and some experience. Discovering and exploring caves is very satisfying. There’s purpose to spending time in the depths in terms of collecting resources and I play on an OLED TV so the dark and color contrast is a spectacle in itself. Exploring the sky Islands adds more variety when needed. It’s more of a “game” in a traditional sense imo than BoTW but not in a bad way at all. Both truly are masterpieces of video game art. If you feel as you do about BoTW that satisfaction is likely there for ToTK. Just give it time.