You paid the price that was prevailing at the time of purchase. That's it. If you buy a can of soup at a supermarket for $2.50 and a price of a competing brand was also $2.50, and a week later the grocer has a sale on the comoeting brand for $1.99, do you think you can go back to the grocer and say "I want to switch my soup to save $.51?" Ahh, no.
If SW changed your flight, SW allows you to make a no cost change to a different flight. That would allow you to change to the other flight at no cost.
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