Biden is favored to win according to 538 but Trump and his people have a good shot to steal this election. They have already started creating a brandying that will kill at the election and must be changed head on.
(1) They are working hard to get people to associate rioting with Biden and the Democrats. Ironically during the primary both Biden and Harris came under criticism for being too tough on crime. Biden must come out and condemn criminal behavior and work from the angle that he will protect all people. He will push police reform but will come down heavily on those who riot or vandalize the property of innocent people. The republicans repeat the lie that he wants to defund police, he must put that to rest. He needs to be clear about this message of protecting people and repeat it often.
(2) The Republicans want people to associate the negative effects (shutting businesses, social distancing to the democrats)of covid to the democrats. As people become increasingly frustrated they may take it out on the Democrats. Biden has to be very clear how his approach will defeat Covid and bring back businesses the quickest. That the only way to do this is to be smart about it. He needs to repeatedly hit how Trump's incompetence has caused Covid to destroy our people and economy.
(3) Biden needs to get out and become more visible or risk the Republicans defining him.
(4) Less emphasis on Biden's superior character. Everyone (well most) already knows Trump is trash. They knew that when they elected him and it really didn't matter did it. As one undecided woman stated, she going to vote for whoever is best for her. She didn't mention character.
(5) It's okay to bring up that Trump is an impeached president who was left off the hook by Republican cronies. Trump getting away with crimes is a concept that doesn't sit well with Americans.
Trump is a good actor with stage presence who has a conman's fluidity and instinct. Don't underestimate him. Fortunately our ace in the hole is the Republican's severe underestimation of Biden.