Basically the title, you need to use the skills you have now and be a productive member of society.
I don’t mean go back and show the wheel or try invent germ theory etc.
For example I’m a mechanic i think I could go back to the late 1800s and still fix and repair engines and steam engines.
Maybe even take that knowledge further back and work on the first industrial machines in the late 1700s but that’s about it.
I don’t use a proofing oven, or rely on consistent temperature, even now but it does mean I’m sitting here at midnight baking the rye so it can cool overnight because it wasn’t ready to bake earlier so yeah even here in the subtropics I notice the difference in the winter, bread is slower to rise.
I had friends who moved to the bush and built a clay oven and they said all they could successfully bake was popovers because the oven started hot then cooled off, there was no way to keep it constant.