Get a pro contract. Your sponsors will buy you a very nice 15 pound 11 cog bike with 12-25, 11-23, and whatever other combinations you care to use.

Inability to do that means you're not "maxing out" your 52x14 which is about 31 MPH at cruising intensities you can sustain for an hour (100-105 RPM feels good for a threshold effort) and 42 MPH sprinting (140 RPM is OK in short high intensity bursts) . 50x14 is still a 30/40 MPH combination.

Eddy "The Cannibal" Merckx dominated the spring classics with a 52x13 big gear. For example after summiting the Tour Malet first on stage 17 of the 1969 Tour de France he decided to break away. He didn't let the 130km to the finish line discourage him. He won the stage. He won the polka dot jersey for climbers. He won the green jersey for sprinters. He won the yellow jersey for the overall victory.

I'm guessing that you're not in Eddy's league and can make do with a big gear a notch or notch and a half smaller. Pedal faster on flatter ground. On sustained grades steeper than about 3% get more aero (your speed may even be better than pedaling).

I've ridden a big gear no harder than 50x13 (half a cog bigger than 52x14) since entering the 8 cog era when I realized 50-40-30 x 13-21 meant I could have a low like 42x28 in the mountains west of Boulder, CO and plains gearing for rides east like a 13-19 corncob without changing cogs or wheels which would mean some agreement from my riding group before we rode to our meeting spot. That worked awesome.

I've been playing with 50-39-30 x 14-15-16-17-18-19-20-21-22-23. The 14 is enough to pedal down slopes up to about 3% in spite of being halfway between 52x14 and 52x15.