Blaming trump for everything just won't work, not when you have control of the house, senate and the presidency. What is even more ironic was that Biden repeatedly attacked trump for deflecting blame, and promised the "adults in the room" won't make excuses. If by the mid terms nothing has changed, the electorate won't be receptive to the mental gymnastics required to connect the situation to Trump.
The only thing they will see is that Biden's admin is completely impotent and everything is worse than it was 2 years before. (Even covid numbers are incredibly higher under the Biden admin). So let's hope a miracle happens in the next 6 months because this is has been a slow motion disaster, and no amount of "actually this is perfectly normal but even if it wasnt the presidency cannot be blamed" damage control will magically make things better.