It's almost as if you have absolutely no clue what you're talking about.

Keystone was about pumping oil straight from Canada to the Gulf Coast for the export market, crossing key aquifers to get there. It literally never mattered with respect to US gas prices and never will regardless of what occurs in the future.

The US literally produces more oil today than any country has in the history of the world. One of the main reasons its doing so is because oil prices are high enough to sustain production. Making oil cheaper REDUCES production. Wells become unprofitable to pump and maintain. When Trump negotiated a deal to crash the oil market, thousands of people in the industry lost their jobs.