You can easily live a “lower middle class 1980s life” on minimum wage today. Find a 1980s apartment, an early 2000s used car, and don’t bother paying for TV, Starbucks, a cellphone, etc.
Consumer electronics are cheaper; this is the trend for substitutable goods.
Love me the right 20-30 year old car, but the dramatic cost rise around covid times means the savings is only relative to new. A 3x increase in old car prices hasn’t been matched by 3 fold wage increases for most.
And of course we’re discussing this in a larger conversation about automating away 1980s jobs.
You also aren't buying today's average used car (which has gone up about 50% per CPI numbers, not 300%, since 2020), with a backup camera, blind spot monitoring, side curtain airbags, etc. Hop on FB Marketplace and find the cheapest used car from 2010+ that runs: it's still more fully featured, with better safety and fuel economy than that 1980s car, and likely cheaper in adjusted dollars than 1980s.
What 1980s jobs have been automated away without providing alternatives? Switchboard operator> Call center rep; typist> administrative assistant, video store clerk> regular store clerk, etc.
Remember, the OP wants to live a "lower-middle class (1980s)" life, so he doesn't need the latest camera phone, Snapchat, Netflix, and more.