[Fugue]

Currently writing a short essay for my class. I meant to say, "I don't know what else to do," writing, "何をするのを知ません." When I got it back my teacher told me to insert "ほかに" somewhere around where 何 is, but I don't know if it's before or after. Also she told me to change the second を to か and pointed out that 知ません is used incorrectly (so I'm guessing it's 分かりません?).

Any help would be greatly appreciated, thanks.