The Democrats aren't going to magically turn things around in Congress based on Georgia. Look at how they've performed elsewhere. This election ended up being a (relatively narrow) rejection of Trump but not of the Republican Party. Warnock probably has the better chance and if it were that race alone there'd maybe be a possibility of Loeffler losing but since people will be voting for Perdue at the same time. . .
Best hope is that a lot of Trumpists stay at home either because they think their vote will be stolen or because they believe the GOP betrayed Trump.