| ***spoilers***
There are only two options I am aware of that wcan help you.
1) Start a new game and do not skip quests.
2) Use the console. The commands are readily available, so I will not repeat them here
The other option is to stick with the sad world in which you missed out on these ingame. I personally would start a new character, using a different race and class to explore new gameplay(I find that fun to do.)
You can only get a fortify skill spell in Tribunal expansion. I have personally never did all the spinner quests to get the spell, so that may be an option. But I am sure someone with that knowledge will be along to advise you.
The mudcrab mechant is on a chain of islands south of the mainland near a dwemer ruin(or was it a daedric one, I can't remember.) I remember reading about the crab merchant long after beating morrowind and trying to find it with the directions I had found. I finally went on a quest to find it, and it took me two days. Again someone with precise directions will come along soon, I am sure.
Finally, once you beat the Caius Cosades leaves, the only way to advance is the console or a mod. I've never seen a mod that lets you, but I am sure they are out there somewhere.
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