Donate to Graphene if you have the means.

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That’s a nice start.

To fight despair, organize. Find and join your local advocacy groups for transit, cycling, etc. Many improvements that happen are the result of fierce advocacy behind the scenes.

Or at the very least, participate in a critical mass in your city from time to time.

They need to get on Mastodon and/or Bluesky.

The important point here is side streets in addition to arterials. Many routes through the city are inaccessible via only side streets, and many destinations exist along arterials. His attempt to remove arterial bike routes would make many trips impossible or take significantly longer.