I know this is way to open ended to be actionable (based on what ethical standards, what kinds of products, etc) but could you share how you go about boycotting companies you consider not in compliance with your morals?
If you want to make an impact, look toward political solutions; raise awareness among your friends and family, write to your representatives, send a letter to your local newspaper, etc. etc. The only reason companies are overexploiting these resources is because it's profitable; a small tax or tariff could tip the scales in a much bigger way than your own individual consumer habits ever will.
I agree with what you're saying: spreading the word and trying to have an impact on the system as a whole will help solve the problem.
What if I make it easier for myself to boycott and then communicate to others it would be easy for them too? Feel like this goes along the lines of solutions where you first brute-force-first/bottom-up/do-things-that-don't-scale and then spread the working solution.