Thoughts on modifications to my Spellsword build

At this point, my level 84 Ingin needs to change it up:

As she's at 100 sneak, nearly 100 speech and 96 archery, I think that side of things are fine.

I've legendized Destruction once since I have a zero cost.

I'm thinking of picking up Master Destruction robes and switching to those from armor.

At this level I'm finding illusion pretty useless other than for fun effects and, since it's at 100 and I have the master spells anyhow, I'm thinking of legendizing that as well and only perking it to silent cast.

While I would love to continue gaining levels, I'm not really seeing the point now. I'll take smithing up to 100 again, just so I can make some more Dragon Bone arrows (I have so many bones, may as well use 'em for something).

I'm thinking that I could switch over to mainly mage and pick up Marcurio or just run with Serana as a team for a while (Solstheim and regular adventuring - I really haven't explored very much).

Thoughts?

(BTW: light armor is 85 and 1 handed is at 86 so those don't really need upped anymore - since I don't really use them). in the 90's for Alteration, the 80's for Conjuration and the 70's for restoration so I can always work on those some more.

That doesn't really sound like a spellsword build, it sounds like "I've got everything maxed and can do anything" build. This is a personal preference for me, but if I really want to play a spellsword, I start a new character that has to rely on those skills, even at lesser ranks and lower levels. It doesn't count if you've got a bunch of 100's in your back pocket for when you get in trouble.