Every family gathering with my conservative relatives starting on 1/20, I'm going to complain about prices and ask why Trump hasn't brought them down yet like he said he would on day 1.
Any time gas prices go up, I'll be sure to point it out. Airplane tickets, same thing. Any item that fluctuates in price, I'll be sure to let them know it's clearly Trump's fault it's gotten more expensive. It must be his policies.
When they inevitably bend over backwards to try to explain that it's more complicated than that, I'm going to remind them just how often they complained about Biden being singlehandedly responsible as President for high prices and how easily they said he could bring them down if he just "changed his policies."
I'm sure they'll see no issue with their past positions, but it'll be cathartic for me nonetheless having to listen to them for the last 4 years.
Short answer: the Supreme Court
Longer answer: National emergencies are perfectly reasonable to the SCOTUS when declared by a Republican but ridiculous overreach when done by a Democrat and the SCOTUS will use any opportunity to neuter the power of the federal government where a Democrat is in charge.
"So why don't they just try anyway?" you might ask. And the answer there is that the SCOTUS can do more than just say "you can't do that one thing anymore." They can use it as an excuse to block 100 other things that were either flying under the radar or were being challenged one-by-one previously and tied up in appeals.
Biden tried to regulate CO2 through the EPA. The Supreme Court not only said he couldn't do that, but they concocted a brand new standard called the "Major Questions Doctrine" that basically says government agencies aren't allowed to implement any significant new regulations unless Congress explicitly authorizes them. And now all those under-the-radar regulations are falling like dominoes in the district courts with no path for appeal.