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You are entirely right that almost any change you make on an individual level will not stack up enough to transform the world to carbon neutral or carbon negative. Actions must be collective.

Help your neighborhood, city, state, build and implement a climate resiliency plan. Support and foster societal practices that are less carbon intensive (more bike stands and less parking spots; support public transporation;). Act within your network to promote more sustainable behavior. Does your work have a carpool system? Does your work __or the business you own__ provide incentives to their employees to ride bikes? Does your work recycle? Do you work in an energy efficient building? Is your house/apartment energy efficient? The "Green" trend should never stop. Optimization and efficiency are key.

Monetarily, divest your wealth from high carbon enterprises. Spread this suggestion and work with your employer to provide investment funds that are low carbon. Don't work in an carbon-heavy field. Work to actively solve the problem. Don't buy that Tesla. Don't own a car if it isn't a necessity. Tell other people about your wonderful car free life. Save money on insurance, gas, oil, tires, brakes....

You don't have to go to a completely plant-based diet. Host a party once a month and only serve vegetarian. That converts N hypothetical meat-containing meals into plant-based meals. Maybe someone likes your tofu dish and starts making it every other week for themselves.

A top-down carbon tax is a very logical economic mover, but it is only one tool in the tool belt. Recarbonization of the biosphere (plants, forest) is a necessity to have any chance of going carbon neutral or negative. Also climate change will not be stopping. We __are__ going to be in a different world and people will be in different places than today. The actions taken now will still mean everything to 10+ billion people.