Great book that has guidance about all personal improvement strategies. Even goes into a strategy to buy good clothes, necessary to look and act the part you want to be, simply spend more on less things. Lots of good content, highly readable and highly recommend.

book review
Not Nice: Stop People Pleasing, Staying Silent, & Feeling Guilty… And Start Speaking Up, Saying No, Asking Boldly, And Unapologetically Being Yourself by Aziz Gazipura
Introduction Have you ever said “yes” when everything in your body screamed “no”? Do you find yourself over-apologizing, avoiding conflict, and constantly seeking approval—even at
