Post this in comments under news articles, on social media (if you still have it), or make comments during conversations.
Remember: they don't have to like Trump. They have to dislike Biden.
1) Everything is Biden's fault
10 people killed in Chicago? "Welcome to Biden's America" Wildfires in California? "Biden needs to take action!" Black man shot by cops? "What is our government doing?!?!?!"
2) Biden is a racist
"He immediately surrounded himself with white people" "He STILL hasn't met with Black Lives Matter" "None of his policies benefit black people in any way!"
3) Play a disgruntled lib and plant red pills
"Why did I give him my vote? He's Trump with higher taxes!" "Please, Joe, don't prove my Trumptard brother right, don't side with China on this one." "How did gas get so expensive?"
4) Attack leftist heroes
"Why is Kaepernick quiet on this?" "Where is Greta Thunberg when we need her?" "Washington Post? You do know it's owned by Jeff Bezos, right?"
5) Government is the enemy
"Drumpf is gone, but nothing changed." "They don't care about you or me." "People are suffering, and they're doing nothing!!!"
6) Division "Instead of helping black people, Biden is bringing in more Mexicans." "He's just using black people for their votes."
We don't really need much for this because the truth is on out side.
They have been so focused on getting rid of Trump that they have no idea what they're getting now. They don't realise they've been roped into a hate campaign of propaganda to over through democracy for four years now and a denial of service campaign against Trump.
The propaganda has been designed to make Trump appear so bad that they can get virtually anyone into office no matter how truly bad they are.
For there being unity in the left well this is nonsense, they're the most divisive party. There will be feuding between the Kamalites and Bidenites. The former wants the latter out of the way.
Internally you have the left who simply crave absolute power then those who are totalitarian ideologues with the only thing uniting them is that they believe there can only be one.
You have communists and racists of all sorts that aren't going to see eye to eye. Once Biden starts giving handouts to black supremacists other supremacists are going to say well what about us?
You then have all these extremist groups like BLM and Antifa which have been spoilt allowed to do as they please and won't go away easily.
Then you also have mass media so that even if the DNC effectively takes the country (we're very close to fascism) wiping out the RNC out as an equal rival then there is going to be a big power struggle to take control of the internet as well. The press can often help a fascist regime take over the country but invariably the first thing that happens when a fascist regime takes over the country is that it takes over the press.
Don't underestimate echo chambers.
It goes another way though. Don't underestimate the ability of being able to communicate things differently. A lot of leftists have a kind of media imposed barrier or shields that things bounce off which is the bigger problem. It's relatively easy to condition people to reflect the direct approach.
One way is to just communicate by asking them questions. You force them to think things through that way. I'm not a master communicator, in fact I'm awful which at the same time gives me a certain perspective as well when I've had to make up for that.
If you go direct they have all kinds of stock knee jerk responses preinstalled ready to parrot back at you which are often invalid yet easier to make than to break.
One example from a real life conversation. I say that I think SARS-CoV-2 could have come from the lab and it's not prohibitively improbable either. You'll immediately hear responses like rubbish, the WHO said it's a zoonotic virus, that means it comes from nature. This is obviously a nonsensical argument though explaining why can be difficult.
It takes time and effort to break through these shields. Sometimes because these responses are in common we can share ways through or around the shield we've discovered after hammering on it for long enough. That spares much of the labour.
For example I later asked the same person if they were going to take the vaccine then which one. I then said did you know that vaccine uses a recombinant zoonotic virus made in the lab? SARS-CoV-2 is also a recombinant zoonotic virus. That leaves them stumped and their eyes flittering. You'll notice unlike their previous argument this one is not invalid, not a dirty trick. It's a knock out punch to the head rather than a sneaky blow below the belt. It is however also easy to make and impossible to break.
That argument is nonsensical and boils down to it's from nature because we say it's from nature. It's like instead of saying we call it the China Flu because it's from China saying it's from China because we call it the China Flu. If that's how it worked I could call it the Harmless Flu and people would immediately stop dying from it. You would then have to start calling it the Harmless Flu to save lives.
You can also copy their dirty tricks against them and use worse ones so they'll start to not like it. In that case the intent is not to win the argument but impose rules. If they use dirty tricks then it entitles you to and they won't like it. Next time they'll think twice. I've done this too effectively sometimes. Some people are just like "yes, anything you say" now. They basically don't want to play at all. Usually because when you take all the dirty tricks away they have absolutely nothing.