While it's theoretically possible that they might have spontaneously started doing these jobs if a UBI program had been initiated I'm not aware of any example where this has happened.
Caring for the elderly, caring for children, my elderly neighbour who sometimes picks up trash on the street, etc.
There are all kinds of crucial work our society desperately needs done, but which are often not even conceptualized as work because there's no wage attached to it.
For example, suppose in the past one spouse worked a job for a wage/salary and the other spouse cared for some of the couple's ailing parents, provided childcare, and cooked for the couple's children and parents. Now instead, the second spouse also works a wage job, both spouses pay higher taxes some of which go to caring for the old people, and with the extra income they instead purchase prepared food and pay for daycare. The economy grew a lot because formally unpaid labor is now being paid for, but is everyone better off?
Note: I don't think women should be limited to being homemakers, this is just an example.
If you don't like your job and you don't think it's actually worthwhile it serves as a reminder that you're wasting your potential, and that can be incredibly detrimental.