Or ... consider a triple. Less popular now but the advantages are still there. You get to keep everything you like and add a full range of climbing gears spaced close enough that the shifts are small and easy, a real blessing on long and hard climbs. Expensive - yes. You will probably need new brifters to get triple capable front shifting and a rear derailleur with more chain take-up as well as the crankset and bottom bracket. Longer chain.

Best thing about a triple - that grim fact of life. We age. A triple, especially one based on the tried and true 110-73 BCD chainring standard allows one to easily downsize chainrings as our power ebbs while keeping all the sweet shifting, cassettes, etc we love. I've been on the 110-73 since 1995, first as a 50-38-24 7-speed (and my first ever 12 tooth high gear), then a 53-42-28 9-speed that has evolves to 50-38-24 (still 9-speed). I run cassettes with 23, 25 or 28 inner rings giving me gears of close to 1:1 and lower with great flat ground choices. (I took my racing gearing when I retired from competition in the late 70s and just added a 28 tooth inside ring. When the riding is fast, I pay zero penalty for the low gears and when the road gets very steep, I get to play! Fewer chainrings and you have to start making choices and trade-offs.