You write we should reduce:
international shipping, consumerism, and non-essential air travel
Sure you can but it will be heavily inconvenient (at least for many in the west).
But do you know what reduces the carbon footprint by about 75% in a country like Germany?
1.) Electric cars/trains
2.) Electricity from renewables
3.) Heating using electrical power from renewables (heat pumps)
Of the last 25%, there are 20% from industrial production and in the last 5% you could include air travel (2%) among other things.
Heating and driving and getting power from renewables makes your lifestyle about 0% different from what it is now. Buying goods that last longer even means giving life a touch of luxury. A better, more luxurious lifestyle that produces about 75% less carbon dioxide.
Impossible? In a growing number of countries, this will be possible soon.
Of course, not flying, not consuming gives you that "holy" feeling of "having done something". But done right, a sustainable lifestyle makes the life we have now even better. It takes a bit of political willpower, of course.