I don't think anybody knows what a perfect system is, and there simply might not be one. Any system will have a set of trade offs in the end. What we can do though is look at what sort of selection pressures different types of systems create, and try to tune the rules in a way where individual interest aligns with the common interest. It's going to be a process of trying things, seeing how they work, and iterating. Most people can now see the problems that capitalist relations create, and socialism is a way to address these problems. It's also worth noting that socialism is inherently democratic in nature.