The pandemic slowed down the economy everywhere. Who tweeted what would not change that. Then the pandemic, and people's reaction to it, had a lot of workers realize their job wasn't worth what they were being paid. The unemployment rate has been steadily dropping over the past few months, and the economy is starting to pick up.
As for gas prices, they were steadily increasing under Trump. Then there was a price crash that may have been in response to the COVID shutdowns. Which did recover to previous levels, but steadily declined during those shut downs.
https://www.gasbuddy.com/charts
Macroeconomics can explain that has simply a demand issue. People stopped driving everywhere as they sat at home. This also explains why prices climbed once people started driving around again.
Petroleum is a global commodity. Demand increases elsewhere will impact the price here. A big one is the natural gas shortages in Europe. Industries there are switching to fuel oil because of it.
Then the fracking production is down from its peak. This is because the investors want to see returns on the money they spent, and the continual expansion investment fracking needs to keep production numbers has stopped. I think those with the money have come to realize fracking is not sustainable at a high pace or long term. Of course, this means OPEC+ has more sway on oil's price.
https://fortune.com/2021/10/13/gas-p...rice-jump-oil/
On top of that, there was the fall out from Ida and other hurricanes. Precautionary shut downs and damage had an impact through out the Gulf region of petroleum drilling and refining. A month ago, almost 25% of that capacity was still offline, and it still isn't at 100%.
https://www.spglobal.com/platts/en/m...s-ida-nicholas
https://www.wtok.com/2021/09/23/oil-...stranded-fuel/
These are things beyond any President's control. They could call for an end to shutdowns, which may or may not result in other economic slowdown effects. They wouldn't change the shut downs over seas, which will slow down our economy, since it is all connected.