Given the current state of partisan polarization, it’s unlikely Biden can get majority job approval next year even with the most fortunate set of circumstances. But the good news for him is that he probably doesn’t have to. Job-approval ratings are crucial indicators in a normal presidential reelection cycle that is basically a referendum on the incumbent’s record. Assuming Trump is the Republican nominee, 2024 will not be a normal reelection cycle for three reasons.
There are absolutely very important reasons to still vote for Biden, but you can’t rely on millions of people to all do the right thing just because it’s logical. The person who’s running for office ultimately has the responsibility to ensure people want to vote for them. It’s just not really useful to blame millions of people when you know that there are statistically for sure going to be disaffected people out of those who need to be motivated. It doesn’t even matter whether most voters who would vote for Biden turn out to vote for him - they almost certainly will - because this fight is at the margins, and to win, you have to capture the irresponsible and unreliable people too.