DUVAL!!! is much of the Jacksonville metro, basically. Which of course is extremely near the GA border and has demographics that aren't too dissimilar from the state of Georgia.
I won't go into my in depth opinions about that trend (let's just call it neutral, as nationally Republicans are benefitting a lot more from party switchers who've been voting R since at least 2014 in "registration switches"), but I will say this. Georgia is a Republican state still. Democrats have to do almost everything right - and watch Rs do a lot wrong - to win statewide in GA. Which means it's very impressive Rs have neither Senate seat in the state.
If I'm a R in GA, I'd hope my party nominates a likeable, normal Senate candidate and Dems pair Ossoff with another white candidate for Governor (it probably will be a former Atlanta mayor name Keisha Bottoms, who is black and seems fairly dissimilar to Abrams in her approach). That might be enough to slip Ossoff over the line, assuming a national vote of around D plus 4 or something in the House (GA won't swing as much, a very inelastic electorate).