The best way to help would be to not use plastic at all or significantly reduce the usage rate. You could use glass or steel containers and bottles instead of metal ones, you could substitute  cloth bags instead of plastic or even use cardboard or mushroom packaging. 

If you can't reduce, try reusing the plastic that you do happen to use. Get a reusable plastic bottle instead of a single use one. Try using a ziploc bag multiple times before throwing it away. Maybe those surgical gloves could be washed and used again.

There is always the option of recycling if you do use single use stuff. Hard plastics, like single use water bottles, could be recycled to be made into more plastic. However, recycling still damages the enviroment, it still requires effort to turn used plastic into something brand new.

Another alternative for plastic if you cannot Reduce, Reuse, or Recycle is bioplastic. Bioplastic is a plant based plastic: plastic that is made from plants, not petroleum (a fossil fuel that plastics are usually made of). It could be made from sugar from plants or engineered by microorganisms. These are compostable. They should degrade within 3 months if taken to a compost facility. Keep in mind, these WILL NOT break down if thrown into an ocean or landfill. 

There are many types of bioplastic.

Sugar based bioplastic is made by combining a sugar called thymine and CO2 (carbon dioxide) at low temperatures.

Scientists have also figured out how to use rice to make biodegradable polymers which could be used to make food packaging. 

Edible food packaging can be eaten after being used. It is made from corn and shellfish industry byproducts. 

Some food packaging is even made from food waste. Biofase is turning 15000 tons of avacado seeds into bioplastic every day. Similar processes can be used on shrimp shells and banana peels.

Bioplastic can also be made from seaweed, the perfect non food alternative for bioplastic.