For direct emissions: Stop burning stuff. Do you call it fuel? Stop burning it. Or at least burn it as little as possible.

EVs and heat pumps solve two of biggest personal direct emissions sources: transportation and heating living spaces.

Beyond that, if you own a roof, get solar panels. Those are a modern miracle at capturing 20% of the Sun's energy, when photosynthesis for crop plants is about 1% to 2%.

Grow your own food, if you have a garden.

Get involved in carbon free energy sources getting better and more widely introduced as well as current energy using devices being more efficient ?

Any improvement by an andividual of this kind that gets deployed in scale eclipses any changes of lifestyle of a single.individual can have.

Change policy.

This isn't a problem solved by individualism.