People boycotting certain products only really works if an alternative is available and attainable, or the demand is elastic.

For example, if I go to any grocery store, all the pasta, rice, buckwheat, bread and other staples are packaged into single-use plastic, as are hygiene products like toothpaste and shampoo. I have no choice but to be part of the plastic waste problem since there is no alternative and the demand for food is not elastic—I literally can't go without food and basic hygiene.

But I can and will avoid buying problematic products like teflon cookware, fast fashion, ICE vehicles, tech products with severe privacy/ownership/repairability issues since there are alternatives available and if not, I can go without since eg Alexa smart speakers are not essential for life.

Hence, we need to hold companies, whose products are problematic while not having alternatives and that are essential for life, responsible and force them to change to less problematic practices. In short, eg single-use plastics should be regulated out of existence wherever possible.

And for products that have better alternatives, we need to raise awareness about them and raise their social acceptance/desirability (make them cool). Plus we need to increase their availability and attainability—what use of is an ethical alternative product if it's not easily available in my country or if the price is not affordable to everyone who can afford the "normal" version?