If I had a decent basic income, I wouldn't be working.
Also, it's not like UBI would solve all social problems. Many people who like to work in nonprofits today would continue to do so. Probably even more people would because they would have more of a safety net underneath them while they save the world.
That said, I'm skeptical of a UBI. Too many unknown consequences.
If less people worked, the economy would produce less and we would be worse off.
If I had basic income that pays for everyday expenses, I'd be free to learn something (robotics/automation/mechanical engineering) and find a job in that industry...
I may work as I do now, but only a day or two a week. That would only be if I got very, very bored though.