Need a lower first gear for hills
I'm struggling on grades >6% and really need a lower first gear. Bike is a 2019 Cannondale CAAD12 with OPI Spidering 52/36 in front and an Ultegra R8000 11/30 cassette in rear. 1. Do I replace the cassette, with perhaps an 11/34? Replacing the cassette would also require a derailleur...