If you like The Four-Hour Work Week by Timothy Ferris

 The Four-Hour Work Week by Timothy Ferris
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The 4-Hour Workweek: Escape 9-5, Live Anywhere, and Join the New Rich by Timothy Ferris "offers techniques and strategies for increasing income while cutting work time in half, and includes advice for leading a more fulfilling life." 
 
Here are similar books for those interested in either retiring younger or for those interested in working less, but making more:
 
The 9-to-5 Cure: Work on your Own Terms and Reinvent your Life by Kristin Cardinale
"...groundbreaking new guide outlining an immediate and practical strategy for being abundantly employed in any economy. Learn how to insulate yourself from sudden and total job loss by following the practical advice detailed in each chapter. Earn a good living in any economic environment by learning how to create an exceptional number of career opportunities and then select the offers that are most attractive to you. Create your own schedule and choose when and where you work. Discover a new way to review your skills and the best ways to market them to employers."--catalog summary
 
 
"Join the millions who are starting side-gig businesses, and taking back their financial futures! Do-it-yourselfers and solopreneurs are everywhere, launching eBay stores, artisanal eats, e-books, life coaching services, apps, tutoring businesses - you name it - on top of their regular jobs. They're adding to their incomes, building safety nets, learning new skills, and finding a sense of fulfillment they never dreamed possible. Get in on the action, this book both documents the exploding side-gig phenomenon and supplies how-to information for creating a lucrative venture of your own." - catalog summary
 
 
Roadmap for the Rest of your Life: Smart Choices About Money, Health, Work, Lifestyle-- and Pursuing your Dreams by Bart Astor
"Bart Astor, author of more than a dozen books, offers a comprehensive guide for making lifestyle decisions, growing your nest egg, and realizing your goals. This AARP book-- Provides guidance on the key areas you'll need to consider: finances and work, health and fitness, Medicare and Social Security, estate planning, insurance, housing, and more; Offers expert tips on creating age- and health-specific goals through a personal "Level of Activity" scale based on how active you can and want to be; Includes tips for finding fun and fulfilling activities and even completing your bucket list; Supplies ready-to-use worksheets to help you set and meet financial planning goals, get your legal affairs in order, and maintain adequate health insurance; Contains a comprehensive list of valuable resources."--catalog summary
 
“… reveals the secrets for ensuring a successful retirement--sooner rather than later. After conducting an intensive study of happy retirees to learn the financial practices they hold in common, Moss discovered that it doesn't take financial genius, millions of dollars, or sophisticated investment skills to ensure a safe, solid retirement. All it takes is five best practices: +Determine what you want and need your retirement money for; +Figure out how much you need to save; +Create a plan to pay off your mortgage in as little as five years; +Develop an income stream from multiple sources; +Become an income investor.” –catalog summary