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I think people do appreciate it when it's obvious that someone spent some time and thinking on their post or comment. They don't always land (I spent a week writing a post about Frankenstein and bitcoin and that sure was a dud).
my advice would be to find a niche that interests you and then be consistent. Post about it on some regular schedule. Do some research on it, try to post something about your niche that maybe isn't easy to find or isn't obvious. if it's something you are super interested in, eventually others might catch your enthusiasm.
It sounds like you are more left leaning. I'd be very curious to read quality posts about immigration topics or about climate change. Those are under-covered here and although there are many people who might react somewhat harshly, there are also a number who would appreciate thoughtful posts on those topics. I'm sure there are others.
I don't think people are that harsh on left leaning views as long as they're presented respectfully and with a willingness to discuss, not presented dogmatically and shrilly (though for some reason progressives have a hard time with the last part)
I'm pretty open about my status as a commie and a statist, at least compared to the average SN denizen
So, what advice would you give someone who is sharing quality content but is virtually ignored because they A) can't afford to boost, B) has integrity so they don't self-zap, and C) shares content across all territories so the trust score isn't high (although I'm not really exactly sure how that works..?)