It should be "everyone is responsible for the rise and fall of the world": it refers to every citizen, which can be understood as even the lowest citizen. Together, it is "the rise and fall of a country, and even the grassroots people have obligations and responsibilities."
As a citizen of a country, even those who do the most basic work have the responsibility to make the country rich or weak. Not only the leaders of the country, but also the people of the whole country should make concerted efforts with Qi Xin and Qi Xin, work hard and produce hard, conscientiously do their own jobs and care about the country, so that the country can be Sheng Xing.
Therefore, "water can carry a boat, but it can also overturn it" (of course, the boat here refers to the country, not the national leader). Only when these "waters" work together with Qi Xin to do a good job and support the country can the country become rich and strong; On the other hand, even national leaders, no matter how hard they try, will only be in vain.