I’ve emailed and called my congressional Representative and both California senators. To find contact information for your representatives, go to https://www.house.gov/representatives/find-your-representative.
My email said, basically: this is an unprecedented attack on the foundations of our democracy that requires the Congress to exercise its constitutional power to provide checks and balances. I asked the representative/senator to publicly support impeachment proceedings against the Supreme Court justices in the majority over this power grab (they reserved the sole right to decide what presidential acts are immune) and publicly support expansion of the court to dilute the power of that majority should they remain on the bench.
Follow my script if you like, or do your own thing, but please make yourself heard! They won’t hear you on mastodon, but they do gauge sentiment based on direct contacts they receive.