The second half of being satisfied with your (freelancing or agency) career is having abundant recurring revenue. I recently analyzed revenues, market size and the number of employees per company for ten or so related industries: graphic design, web design, domain industry, hosting industry, digital advertising agencies, advertising agencies, website creation software industry... The numbers told me that graphic design and web design companies cannot even afford to hire a second employee - on average. All the other industries, who are known for relying heavily on recurring revenue, had much healthier business indicators. For example, the market in the U.S. for web design / web development is seven times bigger than i.e. the domain name business, but domain name companies are in much better shape, financially.
I've described my experience with implementing recurring revenue services in my webdev agency in the book I wrote: https://www.simpfinity.com/books/recurring-revenue-web-agenc... - I now firmly believe that charging more + having recurring revenue is the answer to most freelancers' troubles. As soon you upgrade your attitude to charge more for your work, you're ready to start thinking about earning money from existing clients, every month. We've managed to pay for up to 90% of our monthly expenses solely with recurring revenue.