I am a lot younger than you, so I don’t think you should really consider my advice, as our circumstances are different.
Software setups, although I got into very low power consumption things and I have a whole thread for that. Doing micro-servers running ARM and trying to work with what you got is a nice challenge (lower the RAM allocation of your containers, good luck if you plan on running VMs, keep everything as low cost as possible, do not spend too much money, if possible, have a system in place to power off stuff when not in use, like some kind of “business hours” thing, but for your personal stuff).
Living frugally, currently investing in my own skills and diverging them (you never know if IT will always be a thing). Trying to find a cheap forever home, small, something that won’t cost a lot in taxes, because I try to limit the amount of money I spend, so in case I have to go on a lower wage, I would still be within my lower income limits.
From my point of view, I’d be surprised if I’d be allowed to reach mid 40s, I am trying to plan my life like I am not going to live more than 20 years more. Risky if I do manage to get passed that, but the times look too gloom for younger people. Trying to lay-low and live frugally. Looking into tiny homes, getting land and making my own farm, become as self-sustainable as possible. IT makes the big bucks for me right now, but I am not betting on it. If I can live on a small farm that can sustain my food, water and shelter needs, I can just take odd jobs here and there afterwards.
The best-case scenario, which I’m not betting on, is to open a consulting firm and help people with their IT setups for cheap, targeting mostly small and medium-sized businesses. The problem with that though is that I am the kind of person who loves sharing knowledge with my fellow man, I would open source all the details of how to build a good, functional IT setup and stuff. And I’d probably only be left with people who don’t want to learn how to do that, or follow my instructions, so I’d be kind of an outsourced IT setup guy. Maybe I’d be lucky to get customers who are trying to lower their costs of operation, but most people don’t try and do that.
I’m mostly betting on open sourcing, crowd-sourcing and knowledge sharing, hoping that with enough people doing the same, our standards of living will increase. This is how it went for all human history, until monopolies started forming around the intellectual property monopoly privileges. I also plan for open sourcing automating gardening, so plants will mostly take care of themselves and you just go here and there to pick up the fruits or cut some weeds.