I agree that they soundbites haven't worked. Their PR and marketing people are absolutely terrible! The issue is when agitators with alterior motives use those feelings of disappointment and people's natural reactions to feeling the strain of the cost of living to push an alternative agenda.
You can't just move on from the previous three governments because the issues the country is facing do not occur and cannot be fixed overnight. It is the repetition of a pattern seen over the last 40 years:
1979 - Tories get elected, blame the mess the economy was in on Labour (with some legitimacy). They proceed to wreak 18 years of destruction / selling off of public services, cause several recessions, hike interest rates to 15% and increase tax on the lowest earners while reducing it for higher earners.
1997 - Labour get in, reduce tax for everyone, improve failing public services, increase growth and avoid recession until the financial crisis which they didn't cause (but were recognised internationally for managing well) results in the Tories convincing everyone that Labour was somehow to blame for a global economic crisis and have wrecked the economy.
2010 - Tories get in, defund and run services into the ground, raise taxes for everyone, but especially lower earners, growth stagnates, they self-inflict economic damage through Brexit and the Truss budget, increase immigration and 14 years later, its still somehow Labour's fault that the country is in the pan and the Tories are the only ones who can possibly fix it.
2024 - Labour get in, inherit a stagnated, barely functioning economy, decimated public services, and an world teetering on the edge of a nightmare. They are trying to fix it but admittedly have made some fairly major misteps along the way.
People are feeling worse off, but that is the continuation of a trend not a new occurrence.
It is incredibly difficult to bring a runaway train to a halt - but it wasn't Labour that released the brakes and things are measurably improving, even if people aren't feeling it yet in their day to day lives.
The train may not feel like its slowing down yet, but it certainly isn't going any faster.
Do I agree with all of their methods? No - and I've made that clear - but attempting to throw them off the train because they haven't slowed it down yet, when the alternative is putting the people that caused the issues in the first place back in charge is short term reactionism that will only be more damaging in the long term.