So delightfully delightable!
He works on making the foundation spell self-sustaining, and manages a few tweaks that cut the necessary frequency of torture from about once a week to about once in six. He works on generic versions of assorted godslaying options, and information-gathering spells which may be useful to the endeavour. He works on the problem of steadying continents which may be inclined to crumble. He delights his orf and hugs her baby and reads to them from the books in his library and gets along with his daughter better than he ever has before.
And then, when there are no obvious preparations left to be made, he starts working on interdimensional transit. He could probably spend another year just on polishing potential godslaying spells, but it's entirely possible that he'll show up and discover that none of them work and he has to invent a new one from scratch under time pressure.