I've done all but one Shrine at this point, the island one where you lose all your gear. I'll be getting into the DLC once I clear up a few things. Still have to get the shield from the castle, and upgrade a few armors, plus a couple of side quests and Gannon's horse. I know I don't need them, but just for the sake of doing it. Might do some dragon farming to buy a bunch of ancient arrows to make guardian farming a little easier as well. I have the mats for them as I've been killing guardians for a while. I also need to do some Lynel hunting to finish up the Soldier's armor and Barbarian Armor. I've got enough Star Fragments, and a ton of Silent Princess.
Usually I get the shield sooner, but I haven't needed it since I'm good at parrying. I kill most walkers by just hitting their beams back at them. The Guardian shields have done well enough.
Plus, Korok seeds. I've got my weapons filled out, but want to get my shield and bows to max. Both are almost there anyway. The mask is nice for doing that.
Still need to get the Xenogears armor as well. You get the Zora Armor early on just by showing up and the rest is easy to find immediately after, so I haven't bothered with it yet.
It's also much easier to farm for materials in Master Mode, as I mentioned before, getting drops goes much faster when you don't have to deal with the base level enemies that don't drop the upper tier mats all over the map anymore. I've been using time stop more frequently with enemies to make this a bit easier to do.
Bombs also aren't terribly useful against enemies in Master Mode. I still use them, but they really only work well when dealing with the blue enemies. Most everything is black and above at this point. They are good for dealing with Chuus and wolves still, as well as general hunting. They work okay for crowd control, but aren't terribly useful for dealing damage like they were in normal mode.
I tried doing the trials right away and that wasn't happening in Master Mode. On the regular difficulty I'd have had a go of it, but it not been a big deal as I rarely use the Master Sword anyway. I level up the Ancient Armor right away and use guardian weapons mostly. I farm them from the Major Test of Strength shrines. I actually use the master sword as a general purpose tool so I don't have to carry around rock breakers and axes for woodcutting.
Yes, you can use bombs, but I've found you get a better yield using tools. You'll get more bundles of wood on average cutting down trees with an axe than you do with bombs. Same goes for rock breaking tools and ore deposits. You'll also get more stuff out of boxes by breaking them as opposed to blowing them up. It also doesn't send stuff flying all over, making it easier to grab.
The description on Majora's Mask sucks. I haven't been using it because I wasn't sure exactly what it did. Looked it up and honestly, I haven't missed it. I have all the masks and use the one best suited to the situation and it's worked out pretty well. Apparently it's a combination of all the Kilton masks, plus the Radiant armor. That's convenient for my next playthrough, but at this point it doesn't do me a lot of good.
Also, I love the Ganon armor. It makes running around at night a lot less of a pain. Plus, it's stealth armor. I've used it a lot more often than the Shika armor and am still using it in the endgame to run around at night. It's great for nighttime gathering.
The Phantom armor is also really nice. It's much easier to get than the Barbarian armor, has a decent starting game armor level, and made getting through the early game areas much less of a pain. I was able to do some things sooner because I nabbed it early on. I've actually been putting off upgrading the Barbarian Armor because I've just been using that instead. Even at a total of 12 armor it's been enough to deal with pretty much anything.
I also noticed that even the blight bosses regen health. They still stay in their stages and won't regen past a certain point, but you have to press being aggressive with everything or you'll run through a ton of weapons in Master Mode just killing even standard groups of enemies. It's important to stay focused on one, even when you're dealing with a mob. It's worth dealing with the Yiga in order to get the divine beast reward power early on in Master Mode just for helping to clear out those enemy camps.
I also really love that they let you get heart containers instead of that second stamina wheel now. With the climbing trick and Revali's Gale I don't need the second wheel at all, and I don't need to use food to get those extra hearts. The high level horses are the only thing that needs much stamina to do, and they can both be caught with only two wheels. If I really need more, I can just use food. Stamina shrooms are easy to find, there's a bunch under Impa's house.
Also, the healing power is a lot more useful in Master Mode as there is more that can oneshot you for a lot of the game. As I recall fairies were used up first, but they seem to have fixed that. Even the Goron power has been more useful.
There's also more stuff in general in Master Mode I've noticed, as a lot of new chests have been place on those floating platforms. Plus, enemies have better weapons sooner.
In the end, it kind of balances out to be honest, especially if you factor in the new gear. It's not that much harder once you get past the starting area. I still fight less often than I did before, but that's more to save my weapons beating on the tougher enemies. I tend to not fight anything that doesn't have something I need.
I figure a week maybe until I'm done with it again, if that. Not sure what I'm going to play after.