I'm often dismayed by how unavoidable plastics have become. I've composted and burned everything that I could for years, but the garbage can still always fills up with discarded plastic packaging.
I've done some experimenting with burning plastics cleanly in my rocket stove, and had some success. I've also been gathering parts to build a machine that can recycle some plastics into 3d printer filament.
Recycling the nonbiodegradable plastics is really the way to do it while we can limit the production of new plastics to the biodegradable ones. I mostly dispose of mine where they will be recycled.