imperialism dwarfs any domestic concerns you have
if you disagree with this then youve got american leftist brainworms
people who have shitty or bizarre domestic policy opinions but are active anti-imperialists, not in the fake "no more intervention because brown people dont deserve my help" libertarian fasc way, but in the real "hey the us empire should end" way and actually take steps to disrupt that empire are more important and helpful to the world than people who have demsoc or even leftist domestic opinions but standard or null foreign policy (this includes AOC etc)
u can do both, but one of them is required to even be passably useful
telling AOC to have good foreign policy positions (or any at all) en masse isn't the same as telling your union friend that he's a dumbass for not knowing the difference between trotsky and stalin
also i agree that if youre walking up to random people and screaming about the Truth About Syria then youre probably not helping but if youre getting on the case of comfortable "progressives" (especially the ones who are in office!!!) to actually have a foreign scope to us policy then you are probably are helping
what you do about it on an individual level, if youre in the US which im not, is the same thing you do about anything else in the US that affects the federal level. the same levers of power you have to affect what the fed does about your life are the same levers of power you have to affect what the fed does to millions of other people around the world.
strikes, unions, rioting, etc all can apply pressure to stop homelessness as well as genocide
you can relate to your fellow man in the same way the student protestors did in the 70s, since your fellow man if he's worth a damn probably doesn't want to kill 3 million people in se asia either