Many of the things that are bubbling up in society seem all too much the same. Whether it's school or employers or whatever, there's this kind of overvaluing phenomenon, where the rich and/or successful get more rich and/or successful and we attribute their [increasingly, given increasing inequities] freakish success to something about them, as opposed to being in the right fitting environment at the right point in their careers, or corruption, or something broken in the system, or what. If you're too old, too black, too caring, worked at the wrong place, the place changed, didn't go to a prestigious enough school, were too rebellious as a young adult, whatever, don't know the right people, you're screwed.
I'm not sure what my point is, except to say this acceptance-struggle tension you're referring to is even more complicated because it's not just about lowering or raising your own personal expectations or standards, it's about everything else as well, about accepting or struggling against what's broken in society (at the risk of sounding too idealistic or self-righteous).
What do you do when it's not self-hatred vs acceptance, but self-hatred vs societal anger vs acceptance?
That might sound obvious, but it's really easy to maintain a large set of relationships without ever talking about those things. Politics, science, arts, sports, etc. are so easy to fill a conversation with that it's a common pitfall to hardly ever broach the subject of who we are and what we're doing.
Tell a college kid to lower his expectation and he will feel like a "unmotivated" person, tell a 30's/40's that and he will feel like a failure, all his struggle for nothing, and tell a late 20's to lower his expectation and that goes against every self-motivation influencer and (probably) what his surrounding successful peers suggest.
I think most people understand that the answer is acceptance, but how to reach that point, is so different for each person. Because some people overcome it by sheer grit, while some through therapists, it's hard for a person in the grind to realize what course of action is the best, and before it's too late.