Epic Strength (5e Variant Rule)
From D&D Wiki
Epic Strength allows for creatures to exceed a Strength score of 30 without breaking bounded accuracy. For each level of Epic Strength you possess, you add 5 to your Strength score only for the purposes of determining your damage rolls for attacks using Strength and for calculating how much weight you can lift and carry. For all other uses of Strength, such as attack rolls and ability checks, Epic Strength does not provide a bonus.