We should wish each individual Jew and all Jews as one, Ksivah Vachasimah Tovah, Leshanah Tovah Umesukah May you be inscribed and sealed for a good and sweet year!This should be done through any available method face to face, by word of mouth or in writing. Even if we have already blessed a particular individual, we should nevertheless continue to bless them time and again throughout Elul. Our additional blessings can amplify the revealed goodness that had already been designated by Hashem for each Jew and for all Jewry to an incomparably greater extent. It is customary that even children under the age of Bar and Bas Mitzvah wish this blessing to everyone including adults.This is done, despite that fact that it is generally not considered proper for a child to bless an adult.