Make a piano transcription of a prelude and fugue for one hand only, then learn to play it blindfolded with your right hand tied behind your back.
Weren't you learning apassionata, waldstein and Mossgory's "Pictures at an exbidition"?
Don't know where you find the time...

PS: Just been to the "what are you learning" thread, apparently you are also learning schuber impromptu, Liszt HR2 and TE11, Chopin sonata no2 and aiming for Bach's Goldburgs, Liszt's HR12 and Chopin's entire selection of preludes. All this since december 22, you seeem to be rather buissy....
I would suggest you take some time off before you have a nervous breakdown.