Work is like money. The more you have, the more you want to have.
Last biz I was running, I looked for more lines, spreaded too thin. Was on the phone with China all night. A one man band. I was happy (I thought) because I could do it all.
Until the wall came tombling down. Then I had no wish to go on. Lost my drive forever.
Went thru the motions until one day I was facing a judge in bankruptcy court.
This is an extreme, like all I do, but it can serve you as a free lesson.