The data suggests that the deeper the discharge, the fewer the number of cycles. I think the best way to look at it is not to think about cycles, but total Amp hours delivered. For example, assuming a 1C discharge rate, which never happens, but is the metric used to calculate cycle life, if you have a 200 Ah LFP battery, it will deliver 780,000 Ah if recharged at 70% SOC, 580,000 at 50% SOC and 432,000 Ah at 20% SOC. No clue on the effect of a more realistic discharge rate, but I suspect it changes the numbers, so it's your choice to define optimal SOC.....
Look under: NeverDie BMS Standard Series User Guide
https://lithionicsbattery.com/support/
And:
https://oceanplanetenergy.com/wp-content/uploads/sites/86/2015/10/WhatIsLifeExpectancy.jpg