I'm not sure why you're taking this as victim blaming. _Everyone_ needs to change, including the corporations and the very society we live in to make it a goal.
If it wasn't implicit in my fantasy world, there is no more class difference. Everyone has a very good baseline, like _VERY_ good. Clothing, food, transportation, energy, housing. When this is all taken care of in a great way, what exactly will corporations have to sell anymore to have the power they have now?
Personal gain doesn't just mean exorbitant wealth, it means the entire style of life we've built modern society around. Yes, I work for personal gain because I want to travel, eat cool food, and get nice things to make my life better. Everyone does this because they have to. That's not victim blaming, it's a fact of life that everyone does this. Many have to work harder and struggle more because of the inequality of the system that forces the only means of living as "work towards personal gain."
Now just try to imagine for a moment what your life would be like if you didn't have to focus on personal gain, you just implicitly had a guaranteed stable and nice and comfortable life; what would you do? Would you still try to chase only ventures that secure your future further, or would you maybe start to consider more passion projects?
To be perfectly clear, I absolutely understand that this is not as simple of a matter of "hey everyone, let's just be nicer" and then we will have utopia. Far from it, I understand there are deeply entrenched systems that force this way of consumption and struggle on the entire planet.
The first step towards something better however is to accept that it can be possible; as long as we're telling ourselves it can never be better, naturally it's going to be stuck this way. You can see small examples of this everywhere; municipal ISPs versus the incumbent ISPs are a perfect example of a community saying "hey, the corporation is bullshit, let's do our own thing", and this works out pretty well, results in better and cheaper service for communities, and ultimately weakens corporations as they have to play nicer in order to play at all.
What other elements in your life could be improved like this? That is all I'm asking you to think about.