The sentiment is good and largely true. There are some exceptions, but humans in general are social creatures, so we rely on each other and thrive with each other. Even in areas like business, it is often short-sided to see negotiations and deals as a zero-sum game. Win-win situations or at least reliance on mutually beneficial aspects is almost always possible, so looking for ways to cooperate instead of viewing it as having to beat others is helpful. To help change the mindset systemically, I believe we need to rebuild our education, especially school education, so that it encourages working together and being strong together, instead of teaching kids to compete with each other and rely fully on themselves.
I just saw a post about how individualism was created to make sure that capitalism works and companies could make more money. If you have one family living alone, just a father a mother and a child, they need one of everything, they need a nail, they need a hammer, they need plates all for themselves and everyone that may visit, they need everything once. Whereas, a community, that lives together, and shares stuff together, only needs one for all of them. If you need a hammer, you buy one hammer, and ten families use the same hammer instead, compare to getting 10 hammers for each of them.
That's something I read online and made very good sense to me, not that we can make that work in todays world, but if you consider it, your house has stuff that you do not use every single day, it is not something you need constantly, and yet you still have it, instead if you lived like a commune, then you would not need those stuff. You could have one in every community, and people would use it like it's a normal thing. Think of dorms, in your dorms you still survived, and you didn't need everything in your own room, you needed bathroom, bed, clothes, your pc, and basically that's it, personal stuff, rest was common room stuff.