Big stuff? not much. You aren't going to change the political trajectory in a hurry and there is only so much an individual can do.
However, change starts small and it starts local. Get involved in your local government and other judgement making entities. It may not seem like much but when even the school boards are full of Nazis it affects the next generation. Start by making small achievable goals, and by finding like minded people to organize with. Take every win you can get, and a win is one less voice in power telling kids they shouldn't exist or making your parents afraid of Mexicans.
We can also minimize the fallout. There are going to be victims of the policies announced today. Do your best to help them if you can. Refuse to hurt people. Be kind to your brother.
Day 1: World experiences "The glitch" simultaneously and gets set back 24 hours. Dead come back to life, religions take it as proof of god
Day 2: Media: "ground hogs day?" memes: "Its def groundhogs day grandpa has come back from the dead twice."
Day 3: Religious freak out, no one is saying they went to heaven when they died, reincarnation cycle has been haulted, souls bound in earthly bodies
Day 4: Various religions attempt violent crusades, general violence, and mass suicide
Day 5: Nukes
Day 6: No fighting because dying by nukes hurt the whole time
Day 7: Hey want to eat the chocolate bar today? I had it yesterday
Day 8: Live television and internet broadcasts become only new form of entertainment. Massive downloads for rogue like games and short games you can beat in a day. Money starts to lose meaning
Day 9: General Hedonism, people pursue self gratification / or self betterment as nothing else lasts