> entering the industry in the early to mid 2010's i found a landscape filled with self serving product managers, conmen [...]
> [...] the hacker ethos was lost. the culture changed
I'm 41 so I probably entered the IT industry a decade before you. Nothing changed. It was always like that. And I just strongly suspect it's not just IT. That's basically what 'work' and 'business' is.
Basically start having life outside of work. Work is just a source of money. Switch it every 2 years or so to whoever offers you more and chill. If you accidentally land in places that are not horrible then it's a bonus, but job shouldn't be in your top 3 (or even top 5) sources of satisfaction. Try different sized companies, try different modes of work. Just keep your salary climbing and figure out why life is worth living. And I'm not trying to push kids on you. I don't have any. You could just reach back and look at the stuff you did that made you tick. Try to rediscover and extend it. I'm sure dreams of developing groundbreaking technology in business setting wasn't the only thing that made you interested in technology.