If it was my bike I'd get a 50/34 compact crankset.

In fact, I've done that before and I thought at the time that it was the best change that I'd ever made on a bicycle. It was a major transformation. In my case I bought a compact crank that matched my existing bottom bracket. I swapped out cranksets, shortened the chain, lowered the front derailleur and I was good-to-go. The only thing that I had to buy was the crankset.

The trick is finding a compact crrankset that matches your existing bottom bracket.