Can I change my flight back to the original one without changing the original price?

I originally purchased a ticket from Southwest Airlines for $89. I then changed it to another date which cost about $250. Is there anyway that I have the ability to change the flight back to my original one and only have to pay $89?

I know southwest doesnt charge the $150 for flight changes. But.. I was looking online to get my original flight, and it went up to $260. Do I’ve to pay that or can I get the $89 ticket back?