My understanding is that this could be unfixable.
As the issue is the oddity of folks that answer polls.
Again- Not sure if the polls were really that off.
The national Poll in the RCP Average had Biden up by 7.2. He won nationally by 3.8. So a 3.4% difference.
And it wasn't that they overestimated the number of people voting for Biden - They predicted 51.2 vs. the 51% he actually got. They underestimated Trump who got 47.2 instead of the 44% he polled. It might be late deciders or it might be people just not wanting to admit to a pollster they are frothing racists.
As for the state polls, The only state they got completely wrong was Florida.
So let's review -
Florida - RCP - Biden up by 0.9% Trump won it by 3.3%
Georgia - RCP Trump up by 1%, Biden won it by 0.3%
North Carolina RCP Trump up by 0.2, he won it by 1.3
Arizona - Biden up by 0.9, he won by 0.3
Penn - Biden up by 1.2, he won it by 1.2.
Michigan- Biden up by 4.2, he won it by 2.8.
Wisconsin - Biden up by 6.7, he won it by .07, but this had more to do with Trump picking up undecideds.
Nevada - Biden up by 2.7% he won it by 2.4.
Minnesota- Biden up by 4.2, he won it by 7.2
Texas - Trump up by 1.3, he won by 5.8% - Again, a lot of undecideds broke for Trump.
So except for Wisconsin, none of those states were horrifically off.
Now, the pollsters did get OHIO and IOWA way off, but then you look at the polling of those states, they weren't really a lot of them. No one really considered them to be in play, so there wasn't a lot of polling.
Now, if you want to see some crazy results, let's look at NY, where the RCP Average had Biden up by 19 to 32%, but he only won it by 12.7%. Of course, the latest poll they had for NY was in September.
Final Point- Beating incumbents is actually hard. Even a bad incumbent is a known quantity.
It's why since 1900, 14 incumbants have been re-elected, but only 6 have been defeated.
To put in in perspective, in 1976, everyone assumed Jerry Ford was toast. He pardoned Nixon, he stumbled in public, he presided over runaway inflation. There was the image on his watch of evacuating the embassy in Saigon, the first time America had ever lost a war (at least in the public consciousness). Not to mention the fact that he had never been on a national ticket as President or Vice-President.
Yet he still got 48% of the vote compared to Jimmy Carters' 50.1%.