Is the expansion pass worth it for now, or should I wait until they release the next DLC pack and just get it all?
I always find buying all the DLC together ends up saving you cash in the long run. Especially if you really love the game the investment ends up worth it. Although DOOM (2016) ended up having all the DLC released for free. That's one season pass I'm glad I didn't get. It was all multiplayer too which was kind of odd. The original DOOM was one of the original games to make expansions a thing.
And yeah, Majora's Mask is great if you don't feel like dealing with battles at any given moment.