I had done everything in the game and had trouble with one little thing that i wasn't piecing together to complete it, so i had to look up a hint for that, and everyone on the forums were really careful to only give as much information as you need, which i appreciate.
Details
Getting inside the ash twin project. I had even done all the quantum moon stuff - i wish that would have been integral to complete it or at least have given me bigger hints for getting inside
I really love the DLC as well, it's more linear and thus more straightforward but it does a really good job at guiding you such that each discovery leads to the next one, and the tricks you learn to progress are really fun and creative.