If I’m understanding you correctly, then I strongly disagree about what ethics and meta-ethics are for, as well as what “individual selfishness” means. The questions I care about flow from “What do I care about, and why?” and “How much do I think others should or will care about these things, and why?” Moral realism and amoral nihilism are far from the only options, and neither are ones I’m interested in accepting.
If I’m understanding you correctly, then I strongly disagree about what ethics and meta-ethics are for, as well as what “individual selfishness” means. The questions I care about flow from “What do I care about, and why?” and “How much do I think others should or will care about these things, and why?” Moral realism and amoral nihilism are far from the only options, and neither are ones I’m interested in accepting.