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.
You push the Democratic Party candidate to the left. Supporting Republicans (which is what you’re doing if you don’t vote for Joe Biden, full stop) isn’t going to help anyone and won’t get you better candidates in the future. It will literally have the opposite effect. There’s a great batch of possible candidates for 2028 (Witmer, Shapiro, Newsome, etc). Sure I’d prefer them over Biden for 2024 but they’re not running.