Who usually eats 1 year of content in one day, just have to sit down and wait next expansion. But this happens with every existing game.
The only options I see for this kind of player, is play something other until an expansion comes, or next time take it more easy.

Capping everything is really a lot of effort, maybe you can think of save some time doing other things as study, reading good books, or make a walk outside, will helps you better than a shiny best-of-the-game weapon.