You might consider changing your large chainring only. Myself and others have done this. Many replace the 53 with a 50. You don't have to change your crankset. It's cheap & easy. Shimano makes a 50T riing but it usually isn't stocked. Mine cost around $30 and I waited maybe 10-12 days for it. Reducing the front ring by three teeth has the overall effect of reducing each rear cog by approxumately one tooth.

I've attached a spreadsheet useful for gear ratio planning and cadence.