Reduce, reuse, recycle. I stopped buying individual plastic drinks bottles of all kinds over twenty years ago. I still get juices in gallon plastic jugs or glass if I can find them. At least individual glass and aluminum drink containers are still valuable in the recycling market. Straws? Who uses straws outside of childhood? Newsprint, magazines, junk mail, numbered plastics... everything my city takes goes in the recycling bin. Old electronics, batteries and motor oil go to drop off stations.
Since China stopped taking bulk US recyclables last year the recycling market has changed dramatically. Municipal recycling programs have had to send more and more material to the dump which used to be recycled including most of the numbered plastics we take for granted as recycled. If the open market can't recycle we need to subsidize it.
It's what I don't buy which helps the ocean most: I haven't purchased fish or shellfish in thirty years because all those fisheries have been massively over harvested for decades, not to mention all the turtles, dolphins, whales and non-target fish which die in those bastard nets and drift lines.