Well, it's just about Labor Day, and voters are seriously thinking about the election. Right, now Harris has a small lead. The debates, and a potential scandal, could change that, but if these numbers hold, the election will come down to the ground game.
Trump really doesn't have a campaign staff in the traditional sense - he is pilfering lots of money from his campaign and failing to open staff offices in key districts. However, he is getting help from right wing groups that claim to be helping generate turnout.
What this means is that Trump is relying on low propensity (to vote) individuals to go vote with little prodding from his campaign. It could happen but it's unlikely.