
Napoleon Hill's quintessential volume _Think and grow rich_, the all-time bestseller in the field of professional success, outlines the laws of success and sets the standard of today's motivational thinking.
BTW, the business book that helped me the most is barely known: Making Money is Killing Your Business by Chuck Blakeman.
Ultimately people buy from other people, or rarely in high-trust societies, from brands. We in the West recently became used to having the trust it takes to buy from a brand, but this is a rare, modern, exception. It’s sensible to buy from a person you trust - if there’s a problem with the thing you bought, the interpersonal relationship between you and the (human) seller provides assurance you’ll be made whole or at least helped. Whereas buying from a brand requires such assurances be provided by the society in the form of consumer protection laws, courts et al.
Cultivate a brand and an identity, and whatever you make, you can sell - provided it’s relevant and useful to your constituents.
It’s not an easy transition from having a job, but it sidesteps the age discrimination in the job market - and you might even get paid to do what you love.
CBT Therapy is very good. Teaching one that, one's perspective is everything.
Being social, having positive friends.
If there was one book, that changed my mindset from a negative thinker to a positive thinker. Think and Grow Rich, by Napoleon Hill.
And the secret sauce to high performance. Adderall. Alpha-GPC is also very good and worthwhile to try first.
The author interviewed hundreds of the most successful people of his day and distilled their success principles.
It's packed to the brim with practical advice about how to run a business, and how to achieve any goal. Worth a read.
TLDR pick a goal you really care about, develop absolute faith that you will attain it (i.e. practice seeing it as already done, until it feels real), lay out a concrete plan of action for its attainment, and get to work!
(The section on quality and quantity of service rendered is of particular interest.)