Step 2: Try to understand what will actually happen and prepare yourself accordingly. Severe weather systems will probably continue to worsen - you can prepare yourself for those. You can look up the realistic model predictions for sea level rise and compare on a map like [1] what that means and choose where to live accordingly (aside from Florida, the real risks are from hurricanes). Etc.
Step 3: Ask yourself what you can realistically do and what you cannot realistically do. For the things in the latter bucket, refer to Step 2 and don't worry about them so much. For things in the first bucket, do what you can. Personally, I donate to 3 different orgs to more than offset my carbon footprint, and I try to lead a low-carbon lifestyle where possible (don't use A/C or heat as much, eat less meat, drive less, etc.).
Step 4: If you want to take a "big plunge", ask yourself seriously if you would do more good by quitting your job to work on this space, or if something else would be more effective. In most cases, it's more effective to donate more money to the change you want to see, or to become more involved in politics. In most cases, the core causes of climate change aren't going to be solved by new tech.
[1] https://www.climate.gov/maps-data/dataset/sea-level-rise-map...