You might be able to put 25s or maybe 28 tires on it. Also if I'm looking at the right specs you have 50/34 mated to a 12/34 cassette. That's a good gear range. If that's not enough you might be able to change out the 50/34 to some cyclocross gearing like 48 or 46 with a 32...

However I'm assuming your discomfort is with the compact gearing but maybe it's something else? Drop bars? Paddle shifters versus thumb shifters? Or..??

It might take some time to get used to skinny tires and the new position. I remember first test riding road bikes and being wobbly. Instead of getting rid of bike perhaps you just need some interim steps??