More voters means more Democrats, which is why the GOP spends so much time on voter disenfranchisement. Fight back by getting people registered to vote (or reregistered at a current address). This builds the pool of potential Dem voters and increases chances for a blue wave come election time.
If you’re in L.A., the Swing SoCal Left calendar lists nearby voter registration drives that need your help. And/or connect with local chapters of the League of Women Voters, Head Count, Swing Left, or Indivisible.
Start with yourself. Is your registration up to date? Check at I Will Vote.