Can you be a little more specific? Maybe take an example you're familiar with, and give some detail? Maybe a district in FL (since you're probably very familiar with FL, compared to AZ) that is potentially up for grabs if Dems handle it correctly?

I don't, because Florida doesn't have many competitive districts any more. Florida's moved red in a big way, the GOP has been in charge of redistricting through enough cycles to completely gerrymander, and we have enough of a minority population that the Voting Rights Act gerrymander effect makes it even worse. Not a lot of toss-ups here, any more. The real battles are going to be elsewhere.

There are only three GOP Reps that won seats in districts that Harris won. To take back the majority, the Democrats will need to reclaim seats in districts that Trump won. Which means they need candidates that can run well in a purple-shading-towards-red district. Which means that the national party needs to be able to support some candidates - strongly - that might not match up entirely with the profile, positions, or priorities of the base of the party.