Dems biggest problem besides strong candidates for leadership is they need to stop freaking out so much on every loss, and keep pushing a message. Ossoff winning that election was a long shot, and the fact that he got as close as he did was a good sign. It's called progress, which is what they're supposed to be about.
But then when the whole party freaks out over it it makes them look weak as fuck and disorganized, and just looking for the next big "thing" or "message" that will give them the win, rather than just continuing to push and work their ass off every chance they can to build a stronger base.
It really makes them look lazy and that they want/expect something handed to them, which will just make the R's chokehold on them much strong and even push some of their own base away because it doesn't give them anything firm to believe in.
Say what you will about R ideals, but that party has certainly given their voters strong ideals that they will unshakably believe and vote for.