I’m not even sure if terms are necessary, though I don’t mind the idea of a long term where at the end, Justices would have to be re-nominated. The Supreme Court of Canada (SCC) does just fine with lifetime appointments (though we do have mandatory retirement at 75).
I think we could tinker with rules and procedure (for example, instituting strong codes of ethics), but I think what SCOTUS needs is a change in cultural norms, and that’s extremely hard to bring about. The process for appointments to the SCC and SCOTUS are very similar, yet SCOTUS appointments are highly politicized while any “seemingly political” appointments of judges in Canada have faced huge public backlashes.
I think there are many differences that created these cultural norms but IMHO, one of the biggest is the politicization of lower-level judges (as well as other positions). This interweaves law and politics, and it’s not unheard of for members of the judiciary to jump into full political-positions and back again. This is very different than Canada, where we also have many lawyers who enter politics, but that basically closes the door on ever entering the judiciary.