Professional tinkerer and fabrication.
I either occupy my days fiddling with things to make them slightly better or head problems off at the pass by never allowing them to get to failure, or if something breaks I appear, build the part to fix it if I can (possibly improving it along the way) and then go back to tinkering.
I kind of actually do that, though the tinkering is usually more of a free service when twiddling my thumbs. Find myself fixing computers far too much for my taste but that is more my fault than purely circumstances.
Machines is machines so I could do it in a makeup factory for all I care.
Failing that I like to mix things together. I would be content mixing things together in different quantities and categorising them. Probably would be metals and ceramics, but the other day I did watch
While biology has always been my weakest science then thanks to reading
https://berthub.eu/amazing-dna/ all those years ago and refreshing it every so often I sort of just about managed to follow along (things do work far easier if I can think in terms of computers it seems) and the possibilities that grants are insane. It would take me years to get to his level and I don't know if I have the interest to force it through but should he have had some of the skills of my trade what he could do is off the charts. The overlap of biologist and my trade is vanishingly rare (I have met maybe 3 ever, most university courses are lucky to see one per year) and usually more medic focused.