The Talos Principle (+ DLC) and its just-released sequel really fit this niche for me. I’m fighting severe burnout and was specifically looking for a game without time pressure, reflex-based gameplay, or (because I keep bouncing off of turn-based strategy games even though I believe that I love them) complicated stats-based systems.
TTP is about first-person puzzles in the vein of Portal. While some of the puzzles can be difficult, you can work through them at your own pace. The level structure makes it easy to drop in and out of the game whenever, and the gorgeous environments and soundtrack make the world just a generally soothing and immersive place to walk around in.