Depending on the rest of the groupset, you might go up to an 11x34, which would give you a 1:1. That's probably about as low as you can go without a triple crankset.
As far as the top end, you could go to a larger big ring but that usually comes with a larger small ring, which means your low gear gets higher. I don't think you want the gap between the two rings to be more than 16t, or you'll have problems shifting. Also, if you're in 50x11, spinning at 100 rpm will have you going >35 mph. If you're spinning out with a 50 x 11, you could probably just tuck and coast.
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