We don't know what the make-up of the Senate is going to be yet. If the Democrats can win a couple of run-offs in Georgia they will control the Senate. If they can't, McConnell will still be the Majority Leader --and will likely try to Bloch any legislation passed by the Democratic House or requested by Biden.
But that does not mean change cannot happen that's good for the country. Biden is already planning to immediately reverse most, if not all of Trump's executive orders. This will include rejoing the Paris Accords, rejoing the World Health Organization, protecting DACA immigrants, reverse Trump's environmental damage, and change immigration policy.
Here's part of how The Washington Post reports the plans:
President-elect Joe Biden is planning to quickly sign a series of executive orders after being sworn into office on Jan. 20, immediately forecasting that the country’s politics have shifted and that his presidency will be guided by radically different priorities.
He will rejoin the Paris climate accords, according to those close to his campaign and commitments he has made in recent months, and he will reverse President Trump’s withdrawal from the World Health Organization. He will repeal the ban on almost all travel from some Muslim-majority countries, and he will reinstate the program allowing “dreamers,” who were brought to the United States illegally as children, to remain in the country, according to people familiar with his plans.
Although transitions of power can always include abrupt changes, the shift from Trump to Biden — from one president who sought to undermine established norms and institutions to another who has vowed to restore the established order — will be among the most startling in American history.
