You can say this but when a republican policy is "drill for more oil" and a democratic policy is "focus on clean energy," one is easier, cheapens prices, and has readily apparent effects. Many democrat policies are long term goals that people won't notice, and might even hurt them in the short term, but they need to be done. Medicare will increase taxes, supporting Ukraine and not taking Russian oil increases prices, and most people agree these policies are good things. Yet what is the biggest complaint under Biden? Skyrocketing inflation, because the average voter doesn't care about policy they just care how it affects their lives.
You're asking for an impossible solution if you want the party of "this is a hard decision but will benefit us all in the future" to have the same draw as "here's cheaper prices NOW, we'll ignore the future." Not to mention as you already said republicans will block any and all attempts at real change. It's completely unfair that even if 90% of a democrat candidate's platform is beneficial, that's not good enough since they don't have the short-term effects to wow people with. If democratic policies reduced prices and republican policies increased them (say, swap the stances on oil and climate), we could have a literal potato as the candidate and people would run to vote for it.
You've probably seen this but this video is basically exactly why this is the case. I suppose the only path forward is for democrats to exploit anything they can and go even lower (like increasing the number of justices so you get a majority) and then both parties race to see who can exploit the constitution more. I think no democrat wants to do this because it would be insanity, but the Republicans have been doing it for years so there really aren't many options left.