Good thing polls are fake news and we don't have to worry about those anymore, am I right, or am I right? Biden is hitting the low point in his polling at the best possible time for him and Democrats, I think most folks forget after Trump that presidential approval ratings change over time based on the events and news of the day. There isn't a contingent of supporters that are built in to support Presidents no matter what crazy thing happens usually.
Once the Democrats pass the infrastructure bill(s) and get around to passing a voting rights bill, things are likely going to change. Barring some unforeseen event happening that is unpredictable, I think going into next summer as things stabilize and improve with COVID, the economy continues to chug along and grow at a reasonable rate along with the infrastructure bill juicing it even more I am pretty confident the tides will turn again. Things almost always look the worst after the first summer of a new presidents term, everyone was predicting Trumps demise post Charlottesville at this point in his presidency, yet he bounced back too and nearly won the last election so things are way too early to think they have any bearing on the midterms.