There will be no more flip jokes about her private email server. There will be no rope lines to wall off crowds, which added to an impression of aloofness. And there will be new efforts to bring spontaneity to a candidacy that sometimes seems wooden and overly cautious.

Hillary Rodham Clinton declared her campaign for president nearly five months ago, before the startling rise of Senator Bernie Sanders, the volcanic candidacy of Donald J. Trump and the very public exploration of another White House run by Vice President Joseph R. Biden Jr.

In extensive interviews by telephone and at their Brooklyn headquarters last week, Mrs. Clinton’s strategists acknowledged missteps — such as their slow response to questions about her email practices — and promised that this fall the public would see the sides of Mrs. Clinton that are often obscured by the noise and distractions of modern campaigning.

They want to show her humor. The self-effacing kind (“The hair is real, the color isn’t,” she said of her blond bob recently, taking note of Mr. Trump) has played better than her sarcastic retorts, such as when she asked if wiping a computer server was done “with a cloth.”