Think about what people who don't have to work now do and apply it, or alternatively think about what people do in their down time.
My partner paints and does various other types of art. They are disabled and we live in Australia so they have a support payment, meaning they don't have to work for money. They have made some awesome art that I really love and they do it because they want to. There is no time pressure, not external motivation, it is purely intrinsic motivation that drives their behaviour.
I on the other hand have done a bunch of different jobs in which I have made things like in IT where I put together servers and replaced aging infrastructure. The stress of the external time pressures and so on took away a good fraction of the joy of it. In my home lab I have some cool things I have played around with and I genuinely enjoy them, but that is my own stuff with my own money and time, so the joy is there in full.
If I were considering how things would happen in a solar punk future it would not be jobs, it would not be something you are incentivised to do, it would be something you do because you want to, so hours would likely be less and you would likely have multiple fairly different things. I personally would probably cook, garden, care for kids and disabled people, do cool stuff with computers, and learn about genetic engineering and associated cool science stuff. None of those would be 40+ hours a week, but I would have periods of getting stuck into a project and spending a lot of time for a couple of weeks on one thing while reducing the time for the rest.
This all rides on automation taking care of most of the labour requiring tasks. I would still cook because I enjoy it, even though a machine could do it just as well with no effort from me. I would learn about things out of interest, not utility.