These stories rarely mention this for some reason but the bulk of the plastic junk in the ocean is discarded fishing nets, not consumer waste. Reducing the plastic waste you personally generate is still a good idea, of course, but if you really want to have an impact then stop eating fish.
https://www.onegreenplanet.org/news/ocean-plastic-made-disca...
https://news.nationalgeographic.com/2018/03/great-pacific-ga...