Suggestions to indicate the second person pronoun is singular?

One way consists in using the pronoun "yourself" in an apposition.

• Are you, yourself, committed to the goal of taking steps to end this situation?

There is the possibility of using a term of address.

• You, Edward, will go to the mountain and prepare the chalet.
• You, Mister Hill, are being congratulated by the manager.

Another way is the use of a special phrase, such as "of all …", but then something is added to the meaning; therefore, if this added meaning is relevant, there is no problem as you can kill two birds with one stone.

• You, of all the men in the group, decided that this was the right thing to do.

• You, alone, are responsible.