Good strategies to apply:

1 - Don't focus on him. Know who you are focusing on.
2 - Remember this is a regime and he's not acting alone. Aim your messengers to drive a wedge between his collaborators and their supporters. Call on conservatives who believe in the Constitution to stand up today. Don't judge them by who they voted for last time, but by what they do today.
3 - Do not argue with those who support him strongly--it doesn't work. But most of his votes came from people who don't really support him and won't defend him, talk and especially listen to them. If they trust us even a little, if they feel heard, we start to have leverage.
4 - Focus on his policies, not his orange-ness and mental state.
5 - Keep your message positive; they want the country to be angry and fearful because this is the soil from which their darkest policies will grow.
6 - Don't broadcast helpless/hopeless talk.
7 - Support science, artists and the arts.
8 - Be careful not to spread fake news. Check it.
9 - Donate to organizations with a history of effectively fighting for our rights.
10 - Buy from and support corporations that reject his policies. Buy less. Let the others know clearly why you’re rejecting them. Find your power and use it when you have it.
11 - Take time for yourself, your emotions, for solidarity -- and also for time for uncomfortable outreach.
11a - Take care of yourselves. Take time to feel angry and be an ear for people who are hurt. Get it out.
11b - Don't live in a frame of judgment all the time, whether because you believe in loving everyone or just want to win the next election. Be an ear for people who are hurt, from any ideology. Challenge conservatives to be better. Ask them to take responsibility for the parts of Trump's agenda they don't like. Whatever people who voted for him deserve, we need to welcome some of them (not the trolls!) if we want to win future elections. Build a big welcoming tent with education happening inside but no admission requirements.
12 - Repeat key messages. Find a single point of morality that conservatives in your circle should agree with and stand up for, and cut-and-paste it often. Attacking Trump for everything feels like an attack on Trump and wavering people will pick the weakest link in your chain — find one or two things your audience won't stomach and repeat them, giving your conservative friends and family an action step such as writing a letter to their representative. Social media is a stupid way to communicate and it's what we're using, adapt to it. Invite people to talk with you offline (even the unaccepted invitations count!)
13 - Resist! Copy, share, copy or make this your own.

(no attribution, base on a meme floating on facebook)