1921.. Did people mess up their Model Ts?

Grew up hunting, growing, and preserving a good percent of my food. I might need to brush up on specifics but i think i could do okay if i had social supports for my disability (food providers usually do/did)

I'm a structural engineer. I might not have all the materials needed, but I could probably still design old masonry structures if needed.

Given a fresh restart, carpenter or blacksmith 1300s probably. Id loathe the lack of food though

I'd have to re-remember a lot of stuff I've forgotten, but late 70s, early 80s.

Unless you count "typing" as a marketable skill, then I could probably go back to 1872?

I'm pretty good at hunting and gathering. Back before my broken neck and back, I was super into wanting to buy some remote place in the Appalachians and pseudo homestead. I have messed with many of the required skills. I wanted a place in the mountains with a year round creek for a water wheel. Building a foundry and forge, along with a manual machine shop. I was into what I could do using junk from pick-a-part type junk yards. People often only think of parts for whatever low end car, but if you actually have a fundamental understanding of cars and the various technologies in different applications, a junk yard gives tremendous access to industrial technology for many types of machines and equipment. Junk yards are not setup for that kind of thing either. A little bit of flattery and flirting with a cashier goes a very long way when none of the collection of parts on your cart have legitimate prices on the menu.

Even with my disability now, I could probably survive in the wild by trapping game and some minor gardening if the population was low enough and I was in a decent location compared to where/when I live now I'm the era of the 50 year mortgage fuckwit dystopia.

I'm a musician, so my skills have always been in demand, although the wages have always been in dispute for as long as there has been music. People love music, they just don't like to pay for it.

and be a productive member of society

I just write useless software for a useless company. I'm not a productive member of society today, I wouldn't be one at any point in the past. 🤷‍♂️

I can dig a hole in the earth so I'd say my skills apply all the way back to Ur and Sumeria.

I'm a physician - am MD. As long as I don't get burnt at the stake for witchcraft, I could go back as far as I wanted. People's biology hasn't changed much since Neolithic times.

Hmm. Before the end of the 19th century you're going to run into non-standardised/completely bespoke parts problems. How are you on a lathe, or doing blacksmith work? Hot riveting was a separate trade which you wouldn't have to do, at least.

I'm kinda obsessed with what I call technological bootstrapping, and so I have useful book knowledge about every step along the way. Doing it in practice is another thing, though; the locals are going to run circles around me unless I can invent stuff. (And even the scenario rules aside, not starving or being "disturbed" while I work on whatever project is a thing)

So, I think I have to echo the "it's not going great in 2025" answer.