I bought a 1×11 last year (biggest ring in rear was 42) and was concerned about the lower gearing, since it won’t go as low as a 2×10. Immediately I bought a 30T and it was pretty good. Still needed just a bit lower. Found a “dished” or offset 28T from a Canadian company, North Shore Billet, that fit the 64BCD mounting of my SRAM crank. Only slightly moved the chainline in about 1 mm. Worked great. Got the low gear I needed, and still had decent top gear. (I am 62 years old, BTW.)